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www.tomsguide.com/.../usb-ports-stopped-working-acer-aspire-5750.ht... Apr 23, 2014 - USB ports stopped working Acer Aspire 5750. Tags: Aspire. Laptops... I have an Acer 5750 none of the USB ports work I tried disabling them all ... on Acer Aspire 4935 laptop Forum; Acer Aspire Computer - USB not working ...
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.
Is the webcam USB? Try rebooting the computer with no other USB devices connected. If you're still having the problem try it through a separate mains powered hub. Webcams can often overload the USB ports on laptops.
I hope i can help resolve your problem for you.
this may be a problem relating to your system device driver files.
go to My Computer/Control Panel/System/Hardware/Device Manager. at the bottom of the page you will see USB.
If you have any yellow symbols ( exclamation Marks ) then the driver has been corrupted, or installed incorrectly.
if you have a system restore disk. this may solve the problem for you. or recovery cd.
If you require further assistance, please ask.