Power led flash when i try to start up my Mac Pro.

I have a Mac Pro (Early 2008). I have now got a problem. I can't start it up.
When i start it by pressing the Power switch the fans inside start to sound and the powerled beside the power swich starts flashing.
After that nothing more happens ( i have waitind for several hours), I have to stop the Mac by pressing the Power switch.
It looks like the Ram is OK becouse the lams on the Ram boards lights up abd then turns of agian (no indication of error);
i have changed to backup battery and reset the PARAM and SMC with no effect. i have also removed all extra Harddisks and also
the Graphic card to see if ther was any problems with these.
So i guess the the flasing Power led is an indication somthing is wrong but i can't find an expanation when i search the net.

So i guess the the flasing Power led is an indication somthing is wrong but i can't find an expanation when i search the net.
Yes it is.
If it is single flashes something is wrong with your ram. A red diagnostic led may be lit on the riser that failed.
If the flashes are in groups of 3 a bad dimm slot (or slots) were detected and there should be lit diagnostic leds next (or near) to the dimms that failed.
Try reseating your dimm no matter how it is blinking. But look inside for lit diagnostic leds anyhow.
Also blow all the dust out of your machine while you are in there.

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#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

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Power led flash when i try to start up my Mac Pro.

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