Solved. thank you everyone for helping so quickly.
System specs: intel i7-2600k
gtx 580
msi z77a-g43 gaming
coolermaster 850W power supply.
2TB HDD from WD
samsung 840EVO 250gb
16gb DDR3 kingston ram
sharkoon cardreader
disc drive (don't know the brand, sorry)
coolermaster heatsink + fan
antec nine hundred two case
i'm afraid i don't know which bios build i'm at, nd cannot check.
The problem: after powering on the computer the fans start spinning for about 10seconds, and my harddrives start to boot up aswel, but after this the pc shuts down, without even getting to bios and without making a bleep (i don't have a motherboard speaker though, and don't know if there is one build in) and i don't see an indicator led flashing on the mobo
When did the problem start occuring: it started earlier today after i had replaced my old graphics card (gtx 580) with my new one, a gtx 970. i had discharged myself and unplugged my psu.
what have i tried so far:
i have tried placing back my gtx 580.
i have tried booting the pc with only the cpu, 1 stick of ram, the motherboard and psu plugged in. using the on-board gpu.
taking out the CMOS battery.
I have tested my monitor which works fine.
i have cleaned out all the dust (which i do sub-monthly)
made sure all the fans are spinning (the cpu and gpu fan also spin when they're connected)
checked and reseated all cables to make sure they're firmly connected
i'm afraid i don't have another motherboard to test with.
thanks in advance.