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If none of your USB ports work, there could be a problem with your USB controllers. Uninstall the USB controllers via Control Panel - System ... and reboot your laptop. They will reinstall upon bootup. Good luck.
hi, yes it is a motherboard issue-i have 2 of those with same problem. new boards for that model are costly. however i found a work around-get a usb pcmcia card put it in the slot on the side-then plug your mouse or other usb devices and you should be ok! I did this a year ago and it runs like new! way cheaper than getting a new one. this is a big problem with these 5100 models. acer no help-other than selling you a new mainboard. this is the best way 2 make it work again. the pcmcia cards are cheap enough. and after that you can get a usb hub if you need more ports. good luck! and please rate this solution. and make sure 2 turn on the cardbus if not on allready. (in epower manager) this will work! reply if you need help! be well!
Sounds like a hardware issue. I would guess that there is a bad connection between the usb's and the motherboard. If you are comfortable dismanteling the laptop and re-soldering the usb's than give that a try, but I would recomend you give it to a pro.
Here is a link that explains the process.
hmmmm..now that's interesting...usually that's a symptom of the touchpad, not being connected to the motherboard. The way to get to that is to remove the keyboard, and then check the small connector from palmrest to the main board... got backup for your Acer?