Im having tons of problems with this mobo

here goes:

this is for a gateway gt5404 machine.

im reinstalling windows vista and everything is going ok. updates and all. i can install all of the programs fine. but when it comes time to restart the machine the computer hangs on a black screen and then there's "nothing". i figured out that to solve this problem is to shut off the power supply switch, turn it back on, then start up the machine again. after i do that it boots just fine! WTF is this shit? i've installed a clean copy of vista with a format. im beginning to think the mobo is bad and/or ram is going bad.

what do you guys think?

also here's some info on the BIOS settings:

the chipset is an intel i945g/gz rev. A2
southbridge: intel 82801GB (ICH7/R)
LPCIO: SMSC LPC47M182

MOBO: Intel
model: D945GCL AAD75361-201

BIOS:
BRAND - INTEL CORP.
VERSION - CF94510J.15A.0028.2006.1213.1629
DATE - 12/13/2006


i even tried to flash the BIOS with what was given on Gateway's website (Intel's website didnt have the correct one i needed and i have no idea why). it didnt work and failed to load again. eventually when i got it started again, the mobo reverted back to the original settings (like it was saved somewhere). hard coded in perhaps? help!

i should mention that here's info on the mobo:

http://www.intel.com/products/motherboard/D945GCL/index.htm

also when the tower is on its side it doesnt want to run correctly. then when i put it upright it turns on (well sometimes)....

the information was pulled using CPU z

RAMs easy enough to check...especially if you have more than one stick. Could be a bios issue, if this continues ya might try flashing it...but I'd leave that as a last resort.

i did flash it. it didnt help at all.
it has to be a bad mobo

Sorry to say its sounding like that...could be a bad bios chip. Might begin shopping for a new Mobo...