USB Keyboard not working properly even in the BIOS environment !

[m4rstar]

Problem Description :

4 Newly bought desktop computers from the same manufacturer came with USB keyboards which don't work properly on any of them (it doesn't take all character presses , sometimes it takes a long press on the character button and sometimes not , you cannot type a full sentence without missing half of the letters) .
The problem appears from early start-up stages of the PC (when I try to enter the BIOS by pressing <delete> , and also when working with the BIOS.

Necessary Data :

1- PCs are all identical .
2-Each PC has the following characteristics :
a-Processor : intel 2.9 GHz dual core G2020
b-RAM : 2 GB
c-HD : 500 GB
d-MB : ASUS H61 M-K >> Motherboards - H61M-K - ASUS
e-OS : Win7 ultimate x32
Experiments done :

1-I tried every keyboard on another old computer and they were all fine.
2-I tried another PS/2 Keyboard on my new PCs and it was fine .
3-I tried another USB keyboard on my new PCs and the problem is still there .
4-I tried to connect each keyboard to every USB port in the computers and the problem still exists.
5-I tried to update BIOS with a newer version from the manufacturer . The problem still there .
6-I tried to format the hard disk and installed a fresh copy of Win7 and reinstalled all driver definitions properly which was done successfully but the problem wasn't solved .
7-I checked <Device Manager> entries one by one and found out that there is no contradiction between drivers , windows says they are all working properly.
8-Mouse, external DVD drive and USB flash disk all work fine using the same USB ports .
-----------------------
I need you to help me please answering these questions :

1-Can device driver installation inside windows affect performance of the same device inside BIOS ?
2-What could be the cause of this problem and what could be its solution ?


THANK YOU VERY MUCH !

 

[oscer1]

hi, i just had one thought.

go to bios and see if there is usb legacy support if their is enable it.

 

[m4rstar]

Thanks for your reply oscer1

I tried that also . Sorry I forgot to mention it .

 

[oscer1]

since these are all new computers see if the manufacture will give you support on the issue. or just use the ps/2 keyboards. how is the onscreen keyboards? maybe its a glitch with the keyboard controller using usb. strange issue.

 

[rvcjew]

Try seting USB to full initialization in the boot menu, also is it same if you reset your bios to optimized defaults (write down or take pictures beforehand if you can't remember your settings)?