He lives in another state so he's in process of shipping computer back to me as everything we've tried hasn't fixed it. Here's his system:
ECS KN1 Extreme Socket 939 NVIDIA nForce4 Ultra ATX AMD Motherboard
AMD Athlon 64 3500+ ClawHammer Socket 939 Processor
WD Caviar SE WD1600JD 160GB 7200 RPM 8MB Cache Serial ATA150 HD - OEM
MSI NX6600GT-TD128E Geforce 6600GT 128MB PCI Express x16 Video Card
CORSAIR ValueSelect (2 x 512MB) 184-Pin DDR SDRAM Unbuffered 400 PC 3200
AOpen 2-Tone 16X DVD+R 4X DVD+RW 2.4X DVD+R DL 8X DVD-R 4X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2M Cache IDE DVD Burner
NEC Black 1.44MB 3.5" Internal Floppy Drive Model FD1231H-302
Antec Life Style SONATA TruePower 380Watt ATX12V Power Supply
SAMSUNG 710N-BK Black 17" 12ms LCD Monitor 300 cd/m2 600:1 0.264mm Pixel
And here's everything we've tried:
Different monitor w/different cable.
Different video card
Took a stick of memory out and tired other stick in deifferent slot - repeated with other stick.
Can't get into BIO's either as same "No Video Signal" appears when starting up. Everything appears to be running fine on inside - fans, ect.
He is running AVG Anti-Virus, AdAware, Spybot, Windows Firewall, and is behind a router and is hard wired.
Finally convinced it was a power supply issue as Sonata case at that time came with 380w PS with only a 20 pin connector and MB has 24 pin. So replaced it with:
New power supply
OCZ ModStream OCZ45012U ATX 450W Power Supply
And...nothing. He's in the process of shipping it back to me and the only thing I can think to do at this point is to take the MB out and place it on a piece of cardboard to see if possibly some sort of short with case was causing ot to start up. If that doesn't work I'm out of ideas other than returning the MB to ECS to have them check and see if it's bad.
Any thoughts on how to proceed or anything else that might be causing this would be greatly appreciated. I won't have computer till Tuesday night so won't be able to try anything until then.