I'm a first time builder, but I'm fairly certain I have everything correctly installed/connected. My problem is that my system will run for about 20 seconds then lose all power. The light on the mobo stays lit, but everything else dies. I can get into BIOS, but I can't do anything before the system shuts down.
I've tried taking everything out of the system piece by piece to find the problem. The only way it will run is if I take the CPU out. Does this necessarily mean that the CPU is the problem, or could it be the PSU? Any help would be greatly appreciated.
Now I'm thinking that the problem is the CPU heatsink/fan. The stock heatsink has almost no thermal paste and doesn't latch onto my motherboard very well. Is it possible that the CPU is overheating in only 20-30 seconds?
Tear the build back down, put the MB onto its antistatic bag... (possibly on some cardboard if using a hard surface) then rebuild.
1. mount your cpu, cleaned of course...
2. Mount hour HSF, check back of MB for complete latching. Should be pretty obvious. Don't forget to clean it, and apply some new thermal compound.
3. From here, its a bit opinionated... I'd plug in a RAM module, and the Vid card, connect the MB speaker (if its off board) and then hook up the PSU.
OK so far? Yes? Mount MB back in case, proceed with rest of build.
i had the same problem with my first build and it was due to the heatsink not being positioned securely over the cpu. The temps would climb steadily and then after a few seconds the computer would shut off. Make sure you have the heatsink secured and mounted properly and see if that clears up the problem.