room_on_fire

Hello
Had this problem for about a month now and im getting really frustated as i see now way in fixing it.

Basicaly my pc randomly wont boot straight away, but will after resetting the bios. This made me think that my overclocking settings where the problem, however i change them back the second time i boot and run orthos once it reaches windows and it is stable. Another reason why i do not think it is my bios setting is because it used to work just fine, and boot everytime.

Secondly ive removed cd, hd, memory sticks, put fans into different parts of the motherboard, switch psu connectors, tried every single overclocking setting and i still just have no idea what causes it to randomly fail to boot first time.

It sometimes does not post after a restart also, it used to almost certainly not to post after its been off for a long period of time however this does not happen as much as it used too. After it does not post for a while, it reverts back to default bios settings, which i change back straight away and then it works fine. This is very frustating because it used to post first time evertime and now it wont.

Please help and thanks in advence

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MOBO Gigabyte GA-965P-DS3
CPU Intel E6420 2.13 @ 3.5
GPU Sparkle 8800gts 320mb
RAM Geil Ultra DDR2 2.0GB PC6400
HD 2 * 320 GB Western Digital Caviar in Raid1
PSU OCZ 600SXS StealthXStream 600W PSU
CASE ThermalTake Matrix