Computer wont boot up after installing new PSU

Hi all,
Recently I decided to upgrade my PC with a new video card (r9 280x). With that I needed a new psu. I went out and bought the thermaltake sp-850m. I hooked it up installed all the cables and now it won't boot up. So far what I've done is recheck all the connectors and took out the new video card but it still won't boot. It goes for about 10-15seconds and them there is a click and it shuts off. Does anyone know what this is and how to fix it?

I reinstalled the old PSU and it boots fine.

4 answers Last reply
More about computer wont boot installing psu
  1. bad psu, it sounds like.
  2. What was the old PSU?
  3. Alec Bramlett said:
    What was the old PSU?

    The old PSU is a 400w that came with stock with the computer (HPE 380t)
    Also this is a brand new PSU.
  4. Here are the specs on my machine

    Intel Core i7 930 @ 2.80GHz
    15.0GB Triple-Channel DDR3 @ 531MHz (7-7-7-20)
    2048MB ATI AMD Radeon HD 5570 (HP) 124 °F
    Hard Drives
    932GB Hitachi HDS721010CLA332 (SATA) 85 °F
    60GB SanDisk SDSSDP064G (SSD)
    Optical Drives
    hp DVD-RAM GH60L
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