my pc was on,worked fine till this morning. i switched it on and after half an hour monitor went black. On reboot nothing happens. cannot reboot or restart from power on switch. Removed power cable and reinserted it:
-switched pc on
-no signal on monitor
-hd does not run
- graphic card fan does not run
- cpu fan and power supply fan only run
- led remains on.

PLease help don't know what to do!!!

I take it that this is a Desktop machine.

If all connections are well seated and known to be good, symptoms indicate the Motherboard or Power Supply has failed.

Try do a quick system reset and see if that works.

Unplug the power cord to the computer, then pressing the power button do not let go for 20 seconds.
This will discharge and reset the mobo.

Hope this helps!
Bill
Tech Manager