motherboard problem??

[sybertiger]

hi,so i have noidea whats wrong

my moms pc, i5 2400/8gb ram/h61 p21/gt6600

we use the gt6600 as the inboard on the mobo didnt want to work, fewdays ago
it just stoped working,pc turns on,but no video,so thought it was the graphics card,pluged mine in,dont work,plugs hers into mine,works
so thought it was the pci slot that died,orderd a new motherboard it did the samething....

so thought then it may be the cpu that died,so i taken it out swaped it out with mine(my mobo),and BOOM it all worked,pluged in her 6600 also works
swaped the ram mine ram into her motherboard and still dont work,so its not ram?,not the cpu? motherboard? as it works 100% on my board but dont want to work with her old one (h61 p21) so picked up a new h61 p20,and it still dont work

also i tried new powersupplus (3 of them) and every config i can think of,no luck,any ideas what can be wrong

even if i use my ram/cpu/gpu in the two h61's it dont work
what i dont get it used to be my board and it worked all 100% with my graphics card etc (gtx 970)


thank you

 

[Pitbull]

You say the PC boots but no Video as in it doesn't play video files or there is no display at all even when the machines starts?

Just confused with that bit.

 

[etienne_marais]

Into the mothers board-cpu it worked but ram not worked when done so I think cpu on other motherboard must be problem.

 

[sybertiger]

You say the PC boots but no Video as in it doesn't play video files or there is no display at all even when the machines starts?

Just confused with that bit.

yes,screen "on" light just flash,but works fine on the other pc's
and no video at all not even the post screen

Into the mothers board-cpu it worked but ram not worked when done so I think cpu on other motherboard must be problem.

well,i tested both cpu's 2400 and the 3770 both works fine,so cpu not the problem
only thing i saw was,with her 1333ram dont want to boot in my pc,just with mine 1866

but when i swap my ram out to her mobo,dont want to work

thought it would be the speed of it,but dont it auto "under clock" so it works?

will see if i can get some ram somewhere as i dont know that much about pc's and im out of ideas that the problem can be