It sounds like something isn't getting enough power when you start booting. I haven't experienced this before, but I would guess either motherboard (capacitors taking a while to charge possibly?) or PSU (not delivering juice fast enough?).
The first thing I'd do to help isolate the problem is this:
1. Unplug the PC
2. Hold the power button for ~10 seconds
3. Plug the PC back in
4. Wait 30 seconds
5. Press the power button
If that solves your issue altogether, then I'd blame the mobo (but at that point, do you care?). If it solves your issue but only for a little while, I'd say it's inconclusive, as it could be either of the original options. If it doesn't solve your problem, then we're no better off than before testing.
If you have access a spare PSU, I'd obviously recommend trying that out too.
Apparently, your system does not like some of the BIOS settings. It sounds like your system tries to boot and finds a BIOS setting that it doesn't like. So it shuts down, finds a bootable BIOS setting, and successfully reboots.
Try restoring the BIOS to factory defaults. If that doesn't work, try manually setting RAM parameters.
Pull out your CMOS battery. Let it sit for about a minute. Replace it.
You'll have to reset all your BIOS settings after that, but that's the very first thing I always do when I have boot problems. Actually, I have a reset button to make things easier, but that's beside the point... Just try resetting your BIOS/CMOS and see if it does anything.
I just realized what jsc said, and that this is basically do the first half of it - reset it to the factory defaults. Sorry about that...
ok guys, i tried the solutions u gave me..
1.kanenfawder's procedure didnt work...
2.jsc's procedure didnt work either...
3. so did someguynamedmatt & pjmelect's solution...
so im guessing its the PSU?
and one more thing, my computer freezes randomly... when opening multiple applications be it games, youtube, or communication software...
Have you flashed to the latest BIOS version? I have an EVGA SLI board that did this but a bios flash fixed it. I cant understand why any bios would do this unless it was just a glitch. Seems like it would reek havoc on the psu after a while.
Will be getting a 3rd stick soon.. I haven't set the timing manually yet but I have set voltage to 1.6v @ 1333mhz.. unfortunately it froze on me again today.. ill b getting a new corsair psu by Saturday and see if its my mobo that's bad..