Update to below: I think this might have been caused by a lightning strike. Is there a way to know? There was one at our house.
Short version: after replacing my PSU, there was a message about a corrupted main BIOS and it was recovering the BIOS with the backup. When I was finally able to open Windows 7, I was unable to use any USB ports. I have one PS/2 port I can use for either the mouse or keyboard. How do I get my USB ports back?
I have a Gigabyte motherboard with Dual Bios (Ultra Durable model GA-B75M-D3H).
When my computer wouldn't power on, I replaced the PSU. After several tries, I was able to get power, but it displayed the message that the main BIOS was corrupted and it was using the backup BIOS. It took four tries to make it to 100% complete -- it shut down before finishing the first three times.
I am able to start Windows 7, but the USB devices don't work and they do not show up in the device manager. I can use a PS/2 keyboard but have only one PS/2 port and therefore have no mouse (or I can use the mouse only, etc). The USB flash drives are not recognized, and I assume my other USB devices won't be. I tried the mouse on various ports. The mouse does not work in Safe Mode.
The Legacy USB support is enabled in the BIOS (it already was -- I didn't do anything to the settings).
The mouse and keyboard were on a KVM switch but I tried attaching them directly to the PC -- didn't help. The monitor is on the switch and it's fine. At first, the optical mouse lit up when plugged into the KVM switch, but not when plugged directly into the PC. Now it lights up when plugged into any port but doesn't work.
My two questions --
How can I get my USB devices to work?
Do I need to do anything about the BIOS?
Thanks for reading this!
Edited by hamluis, 23 July 2018 - 06:29 AM.
Moved from Crashes/BSODs to Internal Hardware - Hamluis.