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Do you get video at least?
Do you get keyboard during POST? (Try turning the system off, turn it on and keep hitting F8 until you get to a windows boot selection screen)
Does Windows boot all the way up but you just cannot interact with the laptop? Try plugging in an external mouse/keyboard/speakers, or remove it from the docking station if it is attached to one.
If you get keyboard/mouse before windows (able to move up and down the boot selection screen), then Windows may just need to be reinstalled for some strange reason.
If you still aren't getting anything, the motherboard may need to be replaced.
If BIOS menu has User password set then nothing will work until you type in the password.
The keyboard will appear not to be working until correct pwd is typed.
Try entering your password like this
where pwd1 is your guess at the password and <Enter> is when you press the <Enter> key on keyboard.
i had the same problem. apart from keyboard and mousepad, all usb weren't working at all... except the pcmcia slot. so i bought a pcmcia usb card and plugged in the usb mouse and keyboard in those slots. it works! at least on my aspire 5100
I have a Acer 5100 I am facing the same prolem my USB ports stopped working and then the Keyboard the system boots but i cannot do anything like the password nor can i start in safe mode or go to set up, if somebody can help me sort this problem ,thankyou
This is generally a driver glitch. You will need to use an external keyboard and mouse, in order to uninstall the drivers for the onboard keyboard and mouse from the device manager, then disconnect the externals and reboot. The machine will find and reinstall the drivers for them automatically. If this doesn't work, then the problem is with the motherboard and you will need to have it serviced.