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Acer 5100; No response from keyboard, touchpad, or USB devices

PolarBearCubs asked
My brother's Acer 5100 laptop recently lost all keyboard, touchpad and usb functionality... all don't seem to work. I searched on Google for about 10 hours total for solutions and I still don't have a fix for it. It's an Acer 5100 Laptop running Windows XP Home Edition.

Unable to enter BIOS at start-up by pression F2 (keyboard does not work)
USB keyboard and mouse do not work either

This is what I've tried already to no avail:
-Unplug A/C cable, remove battery, reconnect A/C cable (did not work)
-Unplug A/C cable, remove battery, hold power button for 1 minute, reconnect A/C cable (did not work)
-Tried start-up without hard drive to 'get into BIOS'? if i'm correct (did not work)
-Tried a hard drive from another laptop (did not work)
-Jump the J2 breaker underneath the RAM stick, read it would reset the BIOS (did not work)
-Jump the CMOS battery, read it would also reset the BIOS (did not work)
-Checked the keyboard and touchpad connections under the keyboard, both are secure
-Tried the keyboard on another laptop and works there, the keyboard from the other laptop does not work on this laptop
-Tried start-up with linux ubuntu in CD-ROM without a hard drive, as read online (CD booted up and got to a ubuntu screen, but still no keyboard or touchpad response
-Scaned the original hard drive for viruses using a 2.5" external hard drive reader, no viruses found by AVG Free 9.0
-Original hard drive does work on another acer laptop

This is all the steps I've tried so far that I can remember from the past few days of troubleshooting. If anyone knows of a fix for this, help would be greatly appreciated.

Thanks in advance... CJ
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It sounds like the chipset that communicates with the USB and keyboard/touchpad is damaged on the system. Short of finding a used motherboard on E-bay, you may be out of luck.  

Definitely sounds like a hardware issue, not a software issue (so no amount of virus scanning with fix this).  It also sounds like you've exhausted all of the logical options to resolve this.
Top Expert 2013

does it show a screen?
can it boot from a live cd, like Knoppix  : ftp://ftp.kernel.org/pub/dist/knoppix/KNOPPIX_V5.0.1CD-2006-06-01-EN.iso        

no beeps or messages ?

Re-flashing the BIOS has a good chance of fixing it if you can manage to do it without a keyboard or mouse.
Top Expert 2013

i like that --> if you can manage to do it without a keyboard or mouse.


Thanks for the quick responses.

The laptop does boot from a CD as long as there's no hard drive in place. I will try the Knoppix.
There are no beeps or messages, the screen does work.
How could i go about re-flashing the BIOS?

I'll update you guys after trying the Knoppix

Thanks again!
Top Expert 2013

then you can flash the bios, as suggested by edbedb !
when you tried with another disk, were you able to see it in the bios?
if not, i suppose the motherboard is bad (bad disk controller) - you can check the connector though, for bent or broken pins !
Since the hard drive worked on a different machine, it sure sounds like the motherboard has a short or fried controller chip.  When you start trying to troubleshoot those sorts or problems by buying a replacement board, it will quickly become expensive.  You're probably better off buying a new laptop.
Top Expert 2013

the replacement drive, was that the same size? post model or size..