Dell GX240 - only the fan starts when power on, nothing else

I have a gx240.  When I plug in the power cord, the the fan starts.  The  monitor power light goes green for a few seconds, but then back to amber.  Holding on/off button 'in' will stop the fan.  I can then turn on the fan and turn the monitor power light to green for a few seconds by pressing the power button again - but that is all that happens.  I tried replacing the battery with same result.  I have checked all connections with the cover off and can see nothing amiss.

Any suggestions?
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sounds like a dead motherboard - if it is still under warranty call Dell Support to get it replaced ...
It sounds like either a dead motherboard like TBK-Consulting suggested, or a faulty power supply. If you have a spare ATX power supply, you can hook it up with the case open to check.
i"m about 95% sure its the motherboard. if you have two sticks of ram in there test it out with one of them in at a time just to make sure its not memory.
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Power supply is cheaper to replace if it is out of warranty. Try that first.
Power supplies for the Dells with that particular case usually cannot be replaced with anything other than a Dell replacement. Unless you modify the case (need to cut out some metal to make them fit). If it's the SFF GX240, you can only replace it with a Dell unit.
What code does the 4 diag leds on the back of the system show? What color is th power led after you press the power butoon?

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wyatt3Author Commented:
Sorry for my delay in responding - too many other problems.

regarding power supply - I do not have another to substitute.

I tried all the permutations with only one stick of ram.  Same result.

nobus - I tried working though your guide.  Unless I missed it, it does not consider a dead motherboard as a possibility.

jamietoner - thank you for the link.  No lights come on at any time.  No beeps either.

Sounds like a bad motherboard - or at least a dead end.  Unless someone has another idea,  I will soon divide up the points.  Thank you to everyone who responded!!

you missed it - it brings it down to cpu or mobo; and you need another one to know which is good/bad !
in most cases - it will be a dead motherboard (around 95% mobo against 5 % CPU)
wyatt3Author Commented:
Thanks to everyone for their help.
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