Computer not outputting display

Destess

Commendable
Aug 20, 2016
2
0
1,510
So, a friend got a few parts from another friend who said he found them at a dump(?), the parts being an HDD, a CPU and a motherboard, and he later bought a case and PSU from a teacher at the school.

He never really checked the parts out but he said that so far it all turns on. Its a P67 motherboard, so there's no integrated graphics. I had a few spare parts that I know work, which were the RAM, heatsink, and the GPU. These are all non-price heavy parts so I let him borrow them, and as we were working on it, all of the parts were together fine, everything plugged in, and the PSU had enough power to support all of the parts. It was a GT 730, an i3-2120, and a 380W PSU.

The motherboard was an ASRock Fatal1ty motherboard, not sure on the model. We tried each of the graphics ports (even though I knew they all worked) and none of them got the computer to output any display. I know that the RAM works, it used to be a part of my build not too long ago, and hasn't been collecting dust either.

I tried the GPU recently since it was supposed to be for a sidebuild, and I couldn't get it to work (a different question for another time) so I let him borrow it. After we put it all together, the fans started spinning, the GPU didn't really get warm (its a passively cooled GPU, and the cooler got really hot after playing CSGO for a couple of minutes in my other computer, even with a huge bottleneck considering the 4790 in it) so I'm assuming it didn't use it at all.

He also took the CPU out (which he apparently never did before) and saw there was some thermal paste, and we have no clue if it was conductive or not. So I was wondering what I should do to test if the motherboard is faulty, or the CPU is faulty? Or even both? I don't own anything with an 1155 socket so I don't have the ability to see if the CPU works, and I don't have any 1155 CPUs either so its pretty much just troubleshooting.

I'm guessing that the thermal paste was conductive and fried the CPU, or blocked the connection. Is there any other possibilities other than- Frying the CPU, PCI slot being dead, or having a dead motherboard? And how should we test for these different instances? Thanks in advance, I kind of wrote this over multiple segments of time, and I am way too tired and agitated to try to proof read, so sorry if things aren't understood or are repeated; I should be able to respond as to what it is by at least tomorrow morning.

[Edit: massive wall of text converted to spaced paragraphs to aid reading - - - Moderator]
 

Destess

Commendable
Aug 20, 2016
2
0
1,510


There were bent CPU pins but we fixed them- or so we think...

I would guess the socket is the problem between a couple of bent pins that were DIY'd (with a toothpick) and the thermal paste under the pins (we wiped off most of it and waited a couple of days to make sure it was fine to put the CPU back in), but I really don't know enough of PC equipment to say.

Is there some sort of way to check if the CPU is dead from the thermal paste before buying a second motherboard (IF the motherboard doesn't work)?
 
Not really. The only way we will know for sure is if we having a working CPU tested on that motherboard. Or that CPU tested on a known working motherboard. It seems likely that the motherboard is the problem, but I don't have enough information to confirm it.