No keyboard detected

Hello, I need help. bascially my pc just powered off one day / with no display randomly while using it. I tried turning it on again but nothing worked i removed the reset switch on the motherboard then it worked for a day or so but now I see no display, no power to my keyboard or mouse BUT the...

TL-DR (too long didn't read) summary here in the bullet points: PC is stuck at POST with a "NO Keyboard Detected" message. I can't get into the BIOS or Windows. USB Keyboard doesn't work on any USB port, though other devices do connect / light up on USB ports. I have no PS/2 ports, and there...

When I turn on my PC there is one long beep and the USB mouse keyboard and monitor do not receive a signal.i have tested the USB ports with a cell phone charger and they do have power I have checked all of the cables and components everything is firmly plugged in and all fans and lights come on...

I haven’t changed anything or done anything different to my pc, but today when I jumped on I was shown an “American megatrends” screen. It shows no keyboard detected (at the bottom), but still says press F1 to run setup and without the ability to use the keyboard because it’s not being detected...

Currently I need a new motherboard so I feel its a good time to upgrade my question is, Is it worth it to upgrade from an amd fx 6200 to an intel i5 6600k with mobo and ram or keep fx 6200 and just get new mobo with better ram and new graphics card currently I have a gtx 760.