Sometimes my computer won't start

I have this setup for quite a while now (10 months) and lately I get this problem where my computer don't start. Actually, everything seems to be working expect that I dont get anything on my screen (keyboard/mouse don't start). All fans are on (3d card too).

Gigabyte p35-ds3r
evga 8800 gts 384mb
2x1 gig corsair 1066 5-5-5-15
750 W PSU
Seagaate 250 gig barracuda

If I push every wires (on the mb, video card, hdd) it will boot.

If I leave it on idle, it will eventually turn off by itself. If I leave any game open (menu screen) it wil stay on.

Any idea?

I suspect my HDD since if I unplug it , its gonna boot like described.

Thanks for your help!
2 answers Last reply
More about sometimes computer start
  1. Did you update bios lately? If so, clear cmos and load bios defaults.

    So it's a blank screen no-POST issue. Oh, your ram is fast.

    Unplug power cord for 5 mins, remove all ram, remove batter, clear cmos, install battery, try each ram stick in each slot, hook up power cord, power on. If no post, repeat this step until you exhaust all ram configs. Once pc posts, set up memory to 5-5-5-15@800mhz@2.1v.
  2. why would I run my memory at 800 mhz.

    My RAM is fine, I tested it with Memtest.

    By the way, every time I push every wires connections, it boots.

    I don't see how it could be linked to my bios.
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