Computer Shutting Off 30-50 Seconds After Booting

Hi there guys. The title doesn't exactly sum up all of my problem but I will try to clarify in the post.

So for the last week or so I have been experiencing random BSODs with STOP error codes 0x0000007A and 0x000000F4. Last night my computer started locking up during different activities and I had to hard boot. I didn't think too much of it but ran some tests including a CHKDSK because I suspected my HDD might be corrupted. After having done that everything seemed OK and I continued on with my usual business.

The computer locked up again earlier yesterday so I decided I'd open up my case and check the cables and such. It needed a cleaning so I proceeded to take out my GPU and my water cooler fans and radiator for cleaning. After doing that I reseated the GPU and then the fans and radiator and tried to boot up but the cooler fan started making a kind of rattling/abnormal noise and the computer shut down after about 40 seconds or so (it seems to vary). Every time after that the time it takes to shut down is shorter and shorter.

I should also note that all fans are working, the LED lights inside the PSU and on the liquid cooler pump are on, the power button and activity lights are on. The computer pretty much boots up like normal except for the weird pump noises and the shutting down.

SO now I am trying to figure out what's going on. I suspect my cooler pump is malfunctioning but my knowledge of what and why things crap out is minimum.

My computer specs are:

Windows 7 Home Premium 64-bit
AMD FX-8150 Eight-Core @3.6Ghz
Antec Kuhler H2O 920 Liquid Cooling
Gigabyte GA-970A-D3 Socket AM3+ Mobo
Gigabyte Radeon HD7850 2GB GPU
WD Caviar Black 2TB 7200RPM SATA HDD
Rocketfish 750W PSU (It's at least 3 years old. Apparently Rocketfish doesn't even make PSUs anymore...)
6 answers Last reply Best Answer
More about computer shutting seconds booting
  1. Best answer
    check your temps and psu (voltages), sorry i dont know the brand that you have (psu)
  2. Cons29 said:
    check your temps and psu (voltages), sorry i dont know the brand that you have (psu)

    How can I check the temps if the computer won't stay on? Also, I don't have a PSU tester or a volt meter... Temps were fine prior to any of this too. All below average temps during idle and average during gaming.
  3. try booting in safe mode first
  4. Cons29 said:
    try booting in safe mode first

    Can't. It goes to the startup menu but the only options it gives are startup repair and start normally and it shuts down shortly after I pick one. I tried startup repair but as it was loading it just shut off.

    I should note that when it does this the LED logo display on the liquid cooler pump stays lit up like it normally would when shutting down or restarting.
  5. A lot of people I've spoken to have suggested PSU. I had a thought earlier today that maybe the reason my liquid cooling pump is making the weird noise is because it's not getting enough power to run properly. At any rate I am going to pick up a new PSU on Friday and will check back with the results.

    Any other suggestions in the meantime are greatly appreciated!
  6. So it was the thermal paste. Liquid cooling unit needed new thermal and a reseating. Fixed.
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