I am sure that Absic is correct as to the cause of your troubles. It is much more common a problem than most people realise. You didn't mention what PSU you were using also.
Hi
ok I didn't tell you nothing and me problem persists sometimes arrive until "Lauding Operating System" and sometimes only pass to Bios. When my system arrive and I could see "Lauding Operating System" then all run and work ok.
good said this I going to put all things I have into my pc.
ANTEC 850W TRUEPOWER QUATTRO, 850 W
Processor AMD Phenom(tm) II X6 1055T Processor, 2800 Mhz
Mem X2 Kingston KHX1600C9D3/4G
Name ATAPI BD O DH4O1S ATA Device
Name HL-DT-ST DVDRAM GH22NS40 ATA Device
SoundCard X-Fi Titanium Fatality
Graphic card EAH6950/2DI2S/2GD5
Model WDC WD10EARS-00Y5B1 ATA Device
Model WDC WD2500KS-00MJB0 ATA Device <---boot device
Model WDC WD3200AAKS-00VYA0 ATA Device
it's thats all.
one thing more, I've changed already once Motherboard, because I thought it was bad.
what can I do?