Bad Power Supply. Weak voltage power rail.
[There are three main power rails in the SMPS for your desktop computer.
A) The 3.3 Volt power rail
B) The 5 Volt power rail
C) The 12 Volt power rail ]
1) ALL of the LED lights on at once use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical Processor can use 51 to 125 Watts of power.
Just depends on what Processor it.
Remove the Processor, and you will have power to light LED lights, and spin fans.
Of course without a Processor operating, you have No computer.
Replace the Power Supply.
Do you have a KNOWN to be good, Compatible power supply available to use for a test unit?
Need guidance in replacing, or suggestions for Power Supply's to choose from, post In a Comment.
Regards,
joecoolvette
dr-afacan, You unfortunatley are not giving me a lot of info to work with. There could be several things to try. First check your cases front panel to Board connections. Then if they are correct I would swap out the power supply with anything compatible to check and see. If that PS is really OK. If you do not have the info for the board go here http://dlsvr03.asus.com/pub/ASUS/mb/socket775/P5S800-VM/e1767_p5s800-vm.pdf
Next step would be to either check the processor, possible BIOS settings or update. Or you unfortunatley just have a dead board. Asus has a good customer RMA system... Just some thoughts.....PCdok
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