Hello everyone, dear friends. Quite recently, a strange situation occurred at my work, as it seemed to me. The keyboard just stopped working. Or rather, it didn’t completely stop. As it turned out, the keyboard only works in the BIOS, and upon further boot it simply stops responding to any presses.
And then an unpleasant situation occurred, or rather a failure. After the reboot, I had to select the boot mode, but I could not do anything, since none of the keys responded. First of all, I thought that it was the keyboard’s fault, after which I replaced it with a new one, but it turned out, but after I I installed another device, the situation did not change.
In general, I won’t bore you. Most likely you used a USB keyboard, since no one had such problems with PS/2. The thing is that your BIOS disables USB keyboard support when Windows boots.
"How so? After all, everything worked before,” you say. Yes, indeed, everything could work for you, and you could not notice anything, since when you load the operating system, it will automatically activate this support. But once a crash happens and you need to do something during the loading screen, then unfortunately there is nothing you can do.
What to do then? I want to say right away that the first thing you need to do is check the simplest thing that can only come to your mind, because sometimes the problem can really be somewhere on the surface. Therefore, first check whether the keyboard cable is connected to the computer, try moving it to another USB port, and if possible, connect another keyboard.
If none of this helps, then most likely it's a configuration issue. You need to login BIOS, namely at the very beginning of booting your computer, press the function key responsible for entering. Most often this is the key DEL, but in different cases this may be F1, And F2.
As a result, when you get into the BIOS itself, depending on the version, you will need to find an item related to USB keyboard support. It may be called "USB Keyboard Support" or "Legacy USB Support". If you see that the “Disabled” mode is next to these items, then support is disabled and you need to activate the “Enabled” mode.
After that, save all the settings, reboot and voila.
As a rule, this setting is the solution to this problem. Although I heard that this solution did not help someone, and he decided to try to look for the problem in the components. It turned out that one stick of RAM was not entirely working (in his words) and when he pulled it out, the keyboard started working normally. I don’t know how this is connected, but if something happens, you can try this method.
Well, I’ll end here. I hope you liked my article. And if you still haven’t subscribed to my blog updates, be sure to do so now so as not to miss the most interesting things. Well, I'm waiting for you again on my blog. Good luck to you. Bye bye!
Oh these computers, there is always something to do. Back in the days when instead of the Internet there were BBS (Bulletin Board System), replacing the current chat rooms, social networks and file dumps, I said that you can give the computer all the time that you have. And now, with the widespread dominance of the Internet, this topic is even more relevant. And it’s also amazing how some seemingly elementary things, if you call a computer for help, take quite a lot of time. It was a saying. A fairy tale lies ahead.
Let's start from afar. As you all know, a computer without input devices such as a keyboard and mouse can have a touchscreen (and some also have a joystick) - a simple piece of hardware that buzzes and consumes electricity. I received a computer that needed to be looked at and slightly reanimated after a virus had started playing around there. I took a spare monitor from the shelf, connected a spare keyboard, a spare USB mouse (this is important), turned it on, climbed through the BIOS (basic input/output system) settings, loaded Windows and alas, the mouse turned off. I just worked in the BIOS, the pointer moved like crazy, but after loading Windows it doesn’t work. What the heck?
We know that there are at least two common types of mice (computer), differing in connection connector. These are PS/2 and USB. If the first option is used primarily on desktop computers, then the second can be used everywhere, even connected to modern smartphones. And what is important 
Oh, the USB connector can be turned on and off in “hot” mode, i.e. when the computer is turned on, but if you have a PS/2 connector, it’s better not to risk it, as it may simply burn out. It is better to turn off the computer and then connect and disconnect connectors. Older computers had two PS/2 connectors of different colors. Green is for the mouse and purple for the keyboard. Now there may be just one, or even none.
Let's go back to my computer. The symptoms are as follows: The mouse is completely working, it works until the operating system boots, it works all the time on another computer, i.e. it's a Windows thing. The USB port also works, if you connect a keyboard or flash drive to it, then everything is fine. Another USB mouse also does not work. But the PS/2 mouse functions perfectly. When connected to another USB connector, the system writes that a device has been found, the driver is being installed, the driver is installed successfully, but the mouse also does not work.
We look at devices through the device manager. In it we are interested in Mice and other pointing devices. If we don’t see our mouse in the tab, then there is a problem with the driver*. And another problem is that USB mice are so standard that a special driver is not needed and is already in the list of standard ones. We connect the mouse, we see that something new has appeared in the section HID devices, therefore the mouse is recognized not as a mouse, but as something else. At the same time, it makes absolutely no difference which USB port the mouse is plugged into. It won't work. To correct the situation, you must manually change the driver on the HID device. From the HID device context menu, select Update drivers->Search and install drivers manually->Select from installed drivers->HID compatible mouse
After this, the USB mouse appears in the list of mice and starts working. Even after disconnecting and reconnecting and restarting the computer.
*Driver is a program that allows you to directly control the device in the operating system. Since the operating system does not know about all the variety of devices, for full operation, device manufacturers release a driver, which becomes an intermediate layer between the device and the operating system. If the device is standard, then a special driver is not needed; it is already included in the operating system.
The main means of human interaction with the operating system on a PC are the mouse and keyboard.
Therefore, if the display does not have touch functions, then if these tools for user feedback with the machine fail, work stops until the fault is resolved.
The following guide will help you solve the most common problems with this important peripheral equipment.
Where to begin?
The hardware reason is the most common, so if the mouse or keyboard stops working, it is first recommended to visually inspect them in order to identify damage.
If there are no visible defects on the outside of the devices, you need to lift them and shake them; if any of the elements break off or move away from their place, then by the characteristic sound this will help to immediately diagnose the presence of problems in the equipment itself, and not in the PC.
However, it is better not to open or attempt to repair a mouse or keyboard without appropriate experience.
They need to be tested by connecting to another computer and, once you are convinced that they are completely inoperable, simply replace them with new ones.
If the equipment is connected to the PC via a wired connection, then you will need to carefully examine the cable; there should be no cuts, abrasions, kinks, or even more visible breaks.
If a wireless type of communication is used, then change the batteries. When an optical or laser mouse begins to glitch when moving the cursor, the emitter is probably simply clogged and needs periodic cleaning.
It is convenient to use a cotton swab for this. And if you are using an old-style mouse, remove the ball and wash it with warm water and soap.
Before installing the ball inside, you will need to clean the three rollers rotating around it with a cotton swab.
If the device does not respond to key presses, then a clogged contact is also sometimes the cause of the problem. The problem is solved by simple cleaning and removal of accumulated contaminants.
You need to remove the wire plug or transmitter (if it is a Bluetooth device) and insert it into another USB.
When the connection is made via PS/2 or via a COM port, it is imperative to disconnect and connect the peripherals only on a cold PC, i.e. the computer must be turned off (only this condition will provide a safe way to reconnect the equipment).
It should be noted that the mouse freezes in the PC regardless of the installed OS, Windows 7 or the modern “Ten”.
The device's response to human movement largely depends on the state of the emitter and the reflection surface.
If it has pronounced reflective and refractive properties, this can cause response delays for a long time.
After making sure that there are no hardware problems, you can move on to analyzing software faults.
Software glitch
The computer OS interacts with the hardware through special software called drivers. You should first restart your PC.
If restarting does not fix the problem, then you need to perform the following sequential steps:
Important note: The steps below can be performed using only a keyboard or mouse, depending on which device can work properly, and if using a laptop, use a touchpad.
Of course, owners of modern touch screens will not have any difficulties following the instructions.
In the case when the “keyboard” and the “rodent” simultaneously refuse to respond to user input, and at the same time they are connected to a stationary PC without a touchpad and the monitor does not have the proper function for entering information through touch, then all actions will need to be performed through remote control.
In “Seven” you can use “Radmin” for this, which allows you to easily manage your computer through another computer.
Obviously, the peripherals should function properly on this “other” PC:
- Open the “Control Panel” window;
- Go to the “System” tab;
- Click “System Properties”;
- Click “Equipment”;
- Enter “Device Manager”;
- Select problematic equipment marked with a “!” on a yellow background;
- Click “Action”;
- Click “Delete”;
- Click “Ok”;
- Exit “Device Manager”;
- In the “System Properties” menu, open the “Hardware” tab;
- Click “Hardware Installation”;
- Then in the menu that appears, click “Next”;
- Follow the instructions of the master;
- Having completed the procedure, the device will work properly, i.e. the system will be able to see and interact with it again.
Note: if in automatic mode the OS could not find the driver, then the user will be required to download it independently; to do this, visit the manufacturer’s official resource, download the software and install it on the PC.
Often, when purchasing some mouse or keyboard models, driver discs are included with them.
In this case, you just need to insert it into the drive and, after waiting for the installation wizard to start, install the software on your computer.
The result of exposure to malicious applications
A virus can be a source of failure in your computer software, so it is recommended to scan all computer disks for infection with malicious utilities. 
But what to do when security software is not installed on your computer?
If your PC does not have an antivirus program, then free modifications of such programs are available on the Internet for installation and use, which successfully detect many viruses, for example, AVG, NANO and Avir.
But if malware has damaged the registry or other important components of the system, then after treating the PC, in Windows 7 it will be most convenient to simply roll back the OS to a working state, when all elements and connected equipment functioned normally. 
How to roll back "Seven"
During a rollback, the user's personal data will remain intact, but software that was updated after the restore point date will disappear and will have to be updated again.
Do the following:
