system not booting!! NEED HELP ASAP

LordAntrax

Commendable
May 13, 2016
18
0
1,520
So the other day i had a defective motherboard so before it went off on one and broke it worked perfectly fine

i got a replacement one today install it all cpu ram everything but the pc powers on (fans hdd watercooler gpu) but it just doesnt post or boot!!
iv done everything but i think i have narrowed dow the problem!!
the psu 8pin cpu connector thing it may have came loose or the motherboards connections is rubbish

i have tried the same powersupply on my older motherboard that didnt post either

i also found a weird thing i know its a little naughty i know but it was only for 3 seconds i left the heat sink off on both cpus in the same system (at different times obv) my older cpu got warm a little well i think but my new one didnt

but then again it didnt work or post on my old motherboard


pc specs

mobo: asrock 990fx ext 6
cpu : amd fx 9590 (underclocked it)
psu : corsair semi mod 550w
ram: cruical ram 1600h


just want some help narrowing down the problems so i dont spend loads of money on something that isnt needed


THINGS I HAVE TRIED

cmos reset
ram
gpu
changed cpu
used psu on other motherboard (didnt work on other motherboard)
rebuild the whole system
cried a little

 

LordAntrax

Commendable
May 13, 2016
18
0
1,520


firsty wat is the rev??
if the high wattage cpu is what is making the problem i was looking into buying a 750w cpu anyway i hope its not the cpu i have only used it once i have thoughly checked it too there are not bent pins and i have not got the theral paste on the cpu either(i ahve apllied it prperly)
and i cant reach the bios its just i turn on the pc then the fans start spinng that it hdd starts spinning