Hello everyone, mayber someone can help me with this ! I have an old pc with a motherboard SY - 5EHM 1.1 that was running perfect until yesterday. perfectamente. Le agregué unos puertos USB Suddendly after one reboot the keyboard stopped working, I can't even enter the BIOS setup! I've tried another keyboard with the same result, so it seems it might be something in the motherboard. So as it is now, the pc is useless, as I cannot go beyond the memory check!! Does anyone have any idea? Thanks in advance!

eltibetano, Have you tried with a PS/2 keyboard. If it has that port. Have you tried all USB ports? Hace usted intentar con un teclado PS/2. Si tiene ese puerto. Usted ha intentado todos los puertos del USB? Le agregué unos puertos I added ports to ... You added ports?? Explain please, thanks. And all english - thanks ;-) CrazyOne

If ps/2 keyboard don't work..... There is no work around I have found. A local computer repair shop may be able to flash your BIOS.

Sorry, CrazyOne, what I meant was that I added a PCI card with 4 USB ports as the old motherboard do not have them. I could not tried to use a PS/2 keyboard as the motherboard only has one PS/2 mouse port. street1, do you believe that if I reset the BIOS using the jumper, the problem might be solved?

A few things to check (in order of 'easiest to fix'): Some older boards had a 'keyboard lock' switch on the front panel. If it's connect to the motherboard (they're often left unconnected) and the switch is pushed in then your KB won't work. Secondly many old boards had a KB fuse. It's usually on the motherboard close to the KB connection. It might be hard to recognize because it'll look a lot like a resistor and you can't tell it's blown without an ohmmeter. It could also be a bad solder joint on the KB connector or a bad KB controller on the motherboard.

eltibetano, If the 'old motherboard' doesn't have a PS/2 (keyboard) port. And doesn't - well didn't have USB ports. What was used for the keyboard prior, to the PCI card install? Just a second.... I'm seeing that it has two (2)(dos) USB ports, on the motherboard. Well, that's what a couple of clicks on google show me anyway. So, if it does have USB ports on the motherboard. Have you tried to use them. Also, did you disable the onboard USB ports in the BIOS? Either on purpose, or maybe by accident. This is all being asked. With the understanding, that the motherboard, indeed, does have onboard USB ports. I guess, back to what was being used before the PCI card. Please explain, thanks. Also, what does it say on the screen. You say you get as far as memory check, and that's it. What does it say, thanks. And if, if you disabled the USB in the BIOS. You could try clearing the BIOS. That goes back to the assumption. 1.) That the motherboard does, have onboard USB. 2.) It was disabled, for whatever reason. 3.) And if it does have USB ports, they've all been tried. You're Welcome and Thanks, CrazyOne

That's an AT motherboard with, no doubt, a PS/2 mouse connection. I assumed he was using an AT keyboard. If it was a USB keyboard then likely it's a USB port problem.