Computer will run for serveral minutes then shut down. I have new mother board, new power supply. i use cpu paste that is new. the cpu fans starts with a roar and then is very quite.
The initial fast running of the fan is normal, I'm assuming the fan has as 4 pin connector which is the one with thermal control ( fan speed increases as the cpu gets hotter).
Try booting into the bios, in hardware monitor tab, see what the cpu temp is doing and the motherboard temp. Look for any initial overheating. If the bios screen indicates a temperature rise to say 80 degrees within the 1st 3 minutes of booting, then recheck the security of the cpu, the thermal paste used and whether the base of the heatsink is free from pits.
Look also at the power output of the 12v and 5 v etc circuits, make sure they are within 0.5 volts (0.25 is better).
Check the motherboard and connections, in particular, look for blowing capacitors, or signs of arcing that would cause power to earth. You may have a hairline crack in the circuit that is expanding as the board warms up.
Check the ram is right for the board, remove one module at a time, test with it in and out.
Unplug all hard drives and optical drives, see if it boots to the bios and stays on and then replace each in turn.
Check the PSU.. new it may be but it could be faulty
remove the graphics card if fitted and any other slot in cards, test with these out of the computer, disconnect the usb cables from their headers
After that, the issue may be a fault with the switch, the switch wires or a faulty board or cpu.
Jul 22, 2011 |
Gateway 505GR PC Desktop