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Computer problems. Cannot get past Windows Boot Manager as USB ports are not working.

Last response: in Windows 7
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November 24, 2013 4:36:05 PM

My computer kept refusing the different mice I tried to plug in, so I went into BIOS (where the mice would then work) and I turned off USB legacy recongnizer, or something like that. I saved the settings, restartd my computer, and when it turned back on the USB keyboard wasn't working, so I could not get past the Windows Boot Manager. I tried plugging it into a PS/2 port and the keyboard lights up then but still doesn't work. I tried doing a CMOS battery reset, which did not work. I tried doing a CMOS reset with a jumper, which informed me on restart that the settings had been set to default, but my keyboard still didn't work so I couldn't do anything past read the message. I have tried many keyboards. I have tried to boot from a CD, but I can't get to BIOS to tell it to do so.
I am out of ideas. Might you all have any?

My motherboard is an msi Z77A-G41 should it matter.
November 25, 2013 5:51:35 AM

Hows the driver? check USB in device manager. if its not with yellow triangle.
November 25, 2013 6:24:18 AM

rudlan said:
Hows the driver? check USB in device manager. if its not with yellow triangle.


I cannot get to device manager, I cannot get past startup.
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November 25, 2013 6:56:19 AM

lauren62295 said:
rudlan said:
Hows the driver? check USB in device manager. if its not with yellow triangle.


I cannot get to device manager, I cannot get past startup.


RMA your motherboard, something wrong with I/O.
Or try to remove cmos battery and put it back

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December 20, 2013 4:32:01 PM
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I have seen this on quite a few PCs now.
Basically for reasons unknown (but I suspect one of the windows updates) the generic USB drivers get 'lost'

The only solution I have found is to remote onto the PC from another machine and reinstate the drivers, then all will be fine.
!