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I just placed in a brand new PSU and it's a 650W and more then what the system needs. The fans turn on but I don't get anything on the monitor. Ideas?

No beeps. I can't tell if hard drive is running the CPU fan is running at full speed.

EDIT: Could the motherboard have gone bad? It used to work. Could it be possible to flash the BIOS or something?

UPDATE:

SYSTEM http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01466472

New power supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817339012

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    You're sure you plugged everything in? Does the video card need auxillary power?
    – Shinrai
    Commented Oct 18, 2012 at 19:48
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    "No beeps" would lead me to believe it is not POSTing. This could happen if the motherboard isn't getting power. Recheck all your connections, especially the ones to the motherboard.
    – CharlieRB
    Commented Oct 18, 2012 at 19:48
  • Using the Mobo's VGA port. I'll double check the connectors. I figured it was not POSTing.
    – Rachel Nark
    Commented Oct 18, 2012 at 19:54
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    Bad PSU, improperly installed cable, something else knocked loose, left screwdriver in box and it's shorting something...
    – Daniel R Hicks
    Commented Oct 18, 2012 at 21:54
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    You've never bought something that was defective out of the box before??
    – Daniel R Hicks
    Commented Oct 19, 2012 at 0:26

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My bet would be on a DOA Power Supply. Very common, contact the distributor and have them replace it. If it does it again, then it's probably not the PSU.

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