PC WONT TURN ON

Hey guys, the other day i tried to replace an old video card (7900gt), and after i installed the new one (8600gt), nothing is turning on, i put back the old one and it wont come back on either, I tried reseting the cmos, stripping down to the bare essentials (cpu, single ram, and card) still nothing , the mobo makes the normal single beep, but the screen is blank.

do u guys think i fried the mobo?
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More about wont turn
  1. System Manufacturer/Model Number Clone
    OS windows 7 Ultimate 32bit
    CPU athlon 64 3500+ Venice
    Motherboard pc-partner RD580-SB450 ATI Xpress 3200 (RD580) Chipset
    Memory 2GB OCZ dual-channel DDR @ 200MHZ 3-3-3-8
    Graphics Card nvidia 8600 gt MB
    Sound Card realtek
    Monitor(s) Displays 3007fpw
    Screen Resolution 2560x1600
    PSU standard antec 380
    Case Antec
    Cooling Standard
    Hard Drives 320 seagate st3320620AS ATA DRIVE
    Other Info No connection tv out.
  2. Sounds like the motherboard may have defaulted to using the on-board GPU. Have you tried plugging the monitor into your on-board GPU then going into the BIOS and disabling the on-board GPU? You should then be able to use the discreet card.
  3. hey there is no onboard gpu, it must mobo, will start looking for another one.
    thank you.
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