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?
wyatt3Asked:
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TBK-ConsultingCommented:
sounds like a dead motherboard - if it is still under warranty call Dell Support to get it replaced ...
CrystalMethodCommented:
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.
crzyivan0000Commented:
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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nole172Commented:
Power supply is cheaper to replace if it is out of warranty. Try that first.
CrystalMethodCommented:
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.
jamietonerCommented:
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?
http://support.dell.com/support/edocs/systems/opgx240/en/ug/problems.htm#1105025

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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!!

nobusCommented:
you missed it - it brings it down to cpu or mobo; and you need another one to know which is good/bad !
nobusCommented:
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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