[AaylaSecura]

Hello! I have a desktop computer and several days ago my old 500W power supply burnt out (from overheating I suppose) while the computer was on. I replaced it with a new one, 750W, but when I turned it on everything was working properly except for the fact that no USB devices were recognized. I have 2 USB 2.0 front ports and four rear ones. Power reaches all of them, since LEDs on devices connected light up, but OS does not indicate any devices being connected. I tried switching off the PC from the mains, pressing and holding the power button, even removed the battery on the motherboard and reset the BIOS settings. Nothing changed. I have a dual-boot PC with Windows 7 and Gentoo Linux. Neither of the two operating systems give any errors concerning the USB ports and neither recognizes anything plugged in. My PC is:
MB: ASUS P5B
CPU: Intel Core 2 Duo @ 2.33 GHz
HDD: Samsung HD403LJ ATA 400 GB
I don't have a USB keyboard nor a mouse to try and see if they work during BIOS boot. Does anyone have any suggestions?

[managed]

It's definitely a hardware problem if it happens in 7 and Gentoo.

I think your best bet is a PCI USB Card, they are very cheap.

[AaylaSecura]

Thank you for confirming my suspicions. I was afraid it must be a hardware problem. I will order a USB card and post the result when it arrives :-)

[AaylaSecura]

It took its time, but it arrived today and it's all working properly - even the front USBs after being connected to the card. Thanks, everyone!

[managed]

Glad to hear it's working.