Radeon 6850 and 6870 not working

Recently my computer's bios got messed up and i had to send it to hp for repair. Before this i had installed a Radeon 6850 on my motherboard and it ran fine with the psu i bought. When my computer got back it would only run off the onboard graphics an not my 6850. I assumed that it had gotten messed up alomg with the rest of my computer so i bought a new 6870 to replace it. I just installed it and it wont give a signal either. Does anyone know what the problem could be?

this is the tower i have http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c02995511&lc=en&product=5157024
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  1. Unless you also upgraded the power supply, the one that came with your HP is woefully under-powered for your needs. You need at least a 500W power supply with 2 PCIe 6 power connectors.

    It is possible that your current 300W PSU can simply no longer power either the 6850 or a 6870.
  2. Two things. 1) When HP serviced your board they may have set the BIOS to use integrated only. There should be a video setting in the BIOS for auto-detect, integrated, or discrete (PCIe). Go into BIOS, find the video settings and try using auto if that is an option. 2) Your computer specs say 300w PSU so I assume you upgraded your PSU right? Are you sure it can handle a 6870? What's the PSU model?
  3. larkspur said:
    Two things. 1) When HP serviced your board they may have set the BIOS to use integrated only. There should be a video setting in the BIOS for auto-detect, integrated, or discrete (PCIe). Go into BIOS, find the video settings and try using auto if that is an option. 2) Your computer specs say 300w PSU so I assume you upgraded your PSU right? Are you sure it can handle a 6870? What's the PSU model?


    this is the psu i have http://www.newegg.com/Product/Product.aspx?Item=N82E16817371035
    it worked with the 6850 before my computer had to be serviced. Also i went into the bios and only found PCI serr# generation enabled and PCI VGA palette snooping disabled. I could not find any options to change the video source. If it is possible to get a previous version of the bios would that have this setting changed? because when i first got my computer it detected my 6850 fine.
  4. That PSU should be plenty. And you might have to go around in the BIOS a bit and look for that option to change the default video card.

    I'm pretty sure its there, as I've serviced HP's before.
  5. Deemo13 said:
    That PSU should be plenty. And you might have to go around in the BIOS a bit and look for that option to change the default video card.

    I'm pretty sure its there, as I've serviced HP's before.

    i gather my bios should look like this http://h20000.www2.hp.com/bc/docs/support/SupportDocument/c01859075/c01859076.jpg
    and it does except for the advanced tab which is missing the middle section of options as well as AMT options at the bottom
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