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Did I destroy my computers? Need PSU Help

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  • GPUs
  • Computers
  • Components
Last response: in Components
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November 8, 2013 5:14:49 PM

Okay, I know that you are all going to facepalm when you read this, but please bare with me, i'm an idiot.

So, I had purchased a Diamond HD Radeon 7970 for Computer 1 to upgrade my GPU. Upon hooking up the GPU, I realized that it took a 6pin + 8pin(6+2), but I only had a 6pin. Me being stupid decided to hook up the 6 pin without the 8 pin since I didn't have it and see if it'd work. Well, I started up Computer 1, no response obviously so I had to turn it off manually, and afterwards I tried to switch back to my old GPU. Now however, Computer 1 wont turn on.

I decided that maybe I fried my PSU when I had done that since it was only 500w and I didn't have both connections connected, so I went to best buy and got a 850w Thermaltake PSU.

When I had connected this to my Computer 1, I had yet another issue arise. This time I had the correct attachments for my graphics card, but I was missing the 4pin connector on the motherboard. I very briefly browsed online and saw that someone had said that it wasn't necessary (which I know realize was ridiculous), and I tried to start up the PC without it hooked up.
The PC tried to start initially, and almost immediately turned off.

I decided to see if I just destroyed this PSU by hooking it up to a different computer (Computer 2).
After disconnecting Computer 2's 400w PSU, and connecting the 850w PSU, I tried to turn it on. I got nothing except the lights came on for a second and flashed a bit. I decided the PSU was done for, and I disconnected it, and continued to reconnect Computer 2's Original PSU. Unlike the earlier events, I had actually connected all of the necessary connectors this time.
NOW for some reason, Computer 2 wont start up at all. Could I have fried it when I tried to hook up the new broken PSU to it?



So at this point what I know is:
Original PSU in computer 1 is fried
What I don't know is:
Is computer 1's mobo done for?
Is the new psu I bought done for?
Is computer 2's mobo done for?
is Computer 2's original psu done for?

Thanks for reading, sorry it's so long. Please bare with me. XD

More about : destroy computers psu

November 9, 2013 9:09:23 PM

Anyone?
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November 9, 2013 9:19:56 PM

The first one may have been an old PSU that just couldn't power a card that wanted >200W. The second time you hooked it up you left off the CPU power connector, of course it didn't turn on properly.

Use the 8 pin CPU connector from the new PSU and hook half of it into the 4 pin on the motherboard, you can tell the difference between the CPU and PCI-E connectors because the CPU 8 pin will have 4 yellow and 4 black wires while the PCI-E has 3 yellow 5 black.

Do you know computer 2 was functional before you tested it?


If you want to check for basic PSU functionality you can hook up a fan to it and do the test shown in this video, it only tests the ability of it to turn on and provide +12Vish, it does not promise that power_on is coming up in the right time to make the motherboard happy or anything like that, it is just a basic check, if it fails this it is definitely bad, but passing doesn't tell much.
https://www.youtube.com/watch?v=5FWXgQSokF4
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