Trouble installing ASUS gtx550 ti graphics card

Hi--

I need some help installing a new ASUS gtx550 ti card for my Win7 system. I'm pretty knowledgeable about pc's so I'm guessing that there's some simple thing I've forgotten and maybe somebody can point me in the right direction.

After the old graphics card failed, I temporarily switched back to the integrated onboard graphics. Now I can't get the system to recognize the new 550 card. I installed the card in the proper slot and connected cables (the fan runs) but nothing displays on the monitor when I reboot (although Win7 comes up). I've tried going into the bios and resetting the graphics option. There are two choices (IGD and PEG). I've tried them both and neither seems to work with the new card. If I switch the monitor cable back to the integrated output, the display comes up fine.

So, does a dedicated graphics card always override the onboard setting or do I need to manually reset it in the bios? If so, which setting is correct for a dedicated card (IGD or PEG). I assume the IGD stands for Integrated Graphics Device, that is, the onboard graphics chip. Second, do I need to disable any graphics drivers or settings in Device Manager before I switch to the new card?

Thanks for any help.

nothing displays on the monitor when I reboot (although Windows 7 comes up)

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If you connect the cable to the card can you see the white text during boot and can you access and see the bios settings?

Based on what you say it seems you do. If that's the case there must be some driver issue preventing Win 7 from working with the new card. Remove the 550. Leave the cable plugged on the mobo (so that you are using the IGD) and uninstall all that came with the old card, if it was NVIDIA, have a run with driver sweeper (be sure to remove only display drivers).
Then turn off, place the 550, leave the cable where it is. Install the drivers for the 550. Turn off again, and place the cable on the card (and the bios option to use that card), and you should be ready to go.

No, I can't see anything on the monitor. I know Win7 has started only because I hear the jingle. The monitor power light also glows a different color (yellow) than the normal blue. This usually means that there's no signal.

eta: now I'm wondering if the power supply is sufficient. It's a Coolmax 600w which should be just enough.

this calculator helps you estimate if your PSU is enough. Be sure to have connected the additional power connectors as just placing it in a PCI-e slot isn't anywhere enough for it.

If the PSU is enough, and you cannot even see the white text during boot with the cable connected on it I'd say the card is defective. Or maybe the slot is defective, try it in another slot. I doubt it will hurt its performance even placing it on a PCI-e 2.0 x4 slot (as long as it can physically fit anyway, so a x16 phisical but x4 electrical slot).