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New PSU now Computer won't turn on

I just bought a new Graphics Card (XFX 7770) my PSU was crappy so I got a new one to support the new GPU. I installed both PSU and GPU. Now computer wont turn on. I press the power button and nothing happens at all. I checked the I/O switch, checked to make sure main connector was tight and 4-pin CPU. All connections are good. I tried removing the 7770; still no luck. So I put back my old PSU and everything works fine. (Well except the GPU, because it doesn't have a 6-pin connector.)
What could be the problem? Any help is appreciated
Specs:
MB: Asus F1A75-M
CPU: AMD A8-3870
GPU: XFX 7770
PSU: LEPA N500-SA
5 answers Last reply
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  1. DeeJaaY209 said:
    I just bought a new Graphics Card (XFX 7770) my PSU was crappy so I got a new one to support the new GPU. I installed both PSU and GPU. Now computer wont turn on. I press the power button and nothing happens at all. I checked the I/O switch, checked to make sure main connector was tight and 4-pin CPU. All connections are good. I tried removing the 7770; still no luck. So I put back my old PSU and everything works fine. (Well except the GPU, because it doesn't have a 6-pin connector.)
    What could be the problem? Any help is appreciated
    Specs:
    MB: Asus F1A75-M
    CPU: AMD A8-3870
    GPU: XFX 7770
    PSU: LEPA N500-SA


    Here's a link for steps to check if it's dead: http://www.computer-how-to-guide.com/power-supply-troubleshooting/failed-power-supply-psu-diagnostic/. If it is dead then I would send it back and get a new one.(probably under warranty).
  2. Hi. I know this thread is old, but I am having the same problem.

    I went through this: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems and nothing worked. This is my second Corsair CX500 and it starts fine using a paperclip.

    MZN68-LA
    amd athlon 64 x2 6000
    1x1gb pc-3200
    1 dvd drive
    1 500gb hdd
    no mobo indicator light
    tried with and without GTX560

    Out of ideas and very frustrated. Help!!!!
  3. Got this working! Msg if you need help with this.
  4. BNeal said:
    Hi. I know this thread is old, but I am having the same problem.

    I went through this: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems and nothing worked. This is my second Corsair CX500 and it starts fine using a paperclip.

    MZN68-LA
    amd athlon 64 x2 6000
    1x1gb pc-3200
    1 dvd drive
    1 500gb hdd
    no mobo indicator light
    tried with and without GTX560

    Out of ideas and very frustrated. Help!!!!

    I'm having this same exact problem hw did you fix/
  5. See that it's an 8 pin connector you're plugging into a 4 pin slot. It matters which way you plug that in. Let me know how it goes.
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