Dell CPU Fan very Loud

[david500]

Please help
I have a dell Optiplex Desktop GX280 with a very very loud cpu fan.
When I turn on it gives amber light but no boot, just the fan starts going mad. I have
onboard graphics card. I have
• Disconnected all drives and left only motherboard connected,
• Reset bios – no luck
The only thing is when I take the cpu out and leave cpu fan connected then the fan works fine (no loud noise) so I think it is not the fan – but the cpu or a the motherboard / mother board sensor.
I would really appreciate some help as I don’t have a clue what it could be. I don’t get any beeps from the motherboard at all on boot-up with cpu or without. Motherboard power light goes on inside case.
Please please any advise

[Steve R Jones]

What is the history behind the pc/issues?
Was the pc running fine untill recently etc?

[nunyadam]

the fan running at high speed tells me it is a Heat issue. make sure the fan and heat sink are not full of dust.
the back side of the computer will have 4 lights abcd that light up amber or green. all green is good.
look up the manual on dells site it has a chart for what the color codes mean.

[osprey4]

The amber light on the power switch indicates a power supply failure. If you tell me which configuration you have, I can look it up. The larger models use an ATX PSU.

Here are the replacement instructions:
Documentation

[Roevan]

My Dell Precsion had the same problem, CPU fan running wild and the Amber light. Dell Tech support said it was either a MB or PS problem, more likely the MB. I replaced it with a used MB I got off the internet and it's back working. I'm using the same CPU, heatsink and fan. The system does run hot though, 60C.