|"...i ve tried a keyboard with usb conector and doesnt work either..."|
See Response 1 in this:
It's common for corded cables to get damaged such that one or more wires inside the broken are broken, often right near where it enters the keyboard or mouse. If the keyboard or mouse works fine with another computer, there's nothing wrong with it, but if it doesn't work with another computer, try another keyboard or mouse.
A USB only keyboard requires that the bios Setup has the setting Legacy USB devices or USB keyboard or similar enabled in Setup, in order for you to be able to get into Setup, but it should wirk fine otherwise, if the USB controller(s) is(are) enabled in the bios Setup (it is / they are by default).
"Many motherboards still have jumper pins for a 'keyboard lock'. It was originally designed to attach to a keyed switch on the front panel. "
The circuitry for that is usually, if not always, designed such that if you do not connect a switch to the two pins on the mboard for it, the keyboard is always enabled.
Whether or not your mboard has the pins for that is shown in the mboard manual.
"Product: Pcchips / M758lmre"
That's a relatively old mboard.
Some mboards of that era had improperly made electrolytic capacitors installed on them that eventually fail as time goes by.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.: