Same thing happened to me recently..... Computer starts up loads checks stuff then tell u to hit F1 to continue when u do turns off, if u wait tooo long its turns off as well. I am almost 100% sure its your mobo because when i chnaged mine everything worked again no problems.

Just to let u all know i live in AUS PC parts are overpriced these are the cheapest i could find for each part.

Antec 900 $175

Lite On Lightscribe iHAS220 $39

Intel Quad Core Q9550 2.83Ghz 12MB $449 

XFX 780i SLI $300

OCZ Rapter DDR2 1066Mhz (2x2GB) $200 

GTX 280 or GTX 260 not sure yet. (260=$410) (280=$650)

Cooler Master Extreme 600W $100

 Total : $1673- 1913

Im thinking about either gettin the GTX 280 or GX2 not sure though. Anyone own both or one of these and would like ot give feedback would be appreciated.

After 4 years my old PC is dying... This is my new PC whihc i intenet to buy soon, but the cost is high im not sure if any of you could reccomend a cheaper place for sussies to buy comp parts.

Case: Antec 900

Optical Drive: Light On 20X DVD RW Lightscribe

CPU:Intel Core 2 Quad Q9550 2.83Ghz

HDD:640GB 7200rpm Western digital Caviar SE16

Mobo:XFX 780i SLi

PSU: OCZ 700W SLI ready

Video Card:XFX geforce GTX 280 602 MHZ clock

Ram: 4GB DDR2

Total for local retailer: $1 947

NOTE: Would water ooling be recommended?

Opinions would be appreciated and any insight on cheap places to purchase computing parts for aussies would be too.

Reason i chose this mobo is that i may in a few months after buy a second gtx 280

Ok this is the PC I have decided on.

MOBO:XFX Nvidia nforce 790i ULTRA SLI

GPU: XFX NVIDIA® GeForce® GTX 280

RAM: Crucial Ballistix 2GB DDR3 1600MHz (supported by mobo)

HDD: Seagate Barracuda 7200 1TB hard drive

CPU:Intel Core 2 Quad Q9550 2.88GHz 1333mhz FSB

Optical Drive: Lite-On DH-4O1S

PSU:OCZ/GameXstream 850W

Case: Antec 900

This came to $1800 on tigerdirect.

Ok, this is the changes ive made. Also is is better to buy from tigerdirect or newegg when buying from Australia?

MOBO: Nvidia nforce 790i ULTRA SLI

GPU: NVIDIA® GeForce® GTX 280

RAM: Crucial Ballistix 2GB DDR3 (supported by mobo)

HDD: Westgate 250GB

CPU:Intel Core 2 Quad Q6700 2.66GHZ

Optical Drive: Lite-On DH-4O1S

PSU:OCZ/GameXstream 850W

Case: Antec 900

Hope this setup will last a few years.