Hi oneofmanysuns. 2 beeps is a video card initialization error. Review this document under "Step 1: Preparing the computer BIOS" to ensure you have set the BIOS up accordingly.
Adding or Replacing an Expansion Card (Video Card, Sound Card, etc...):
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01761301&tmp_task=useCategory&cc=us&dlc=en&lc=en&product=4066665
The video card specifications suggest a 500 watt power supply minimum. Verify that the 2x6pin connectors are correctly inserted.
The latest BIOS on your HP driver page was released on 2010-11-12
IPMTB-TK Motherboard BIOS Update:
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=pv-88834-1&cc=us&dlc=en&lc=en&os=2093&product=4066665&sw_lang=
There are a few more details in this article if the above doesn't resolve the issue. You might be looking at an incompatibility.
Troubleshooting Video Card Problems:
http://www.mysuperpc.com/vcu/troubleshooting_video_card_problems.shtml
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Re: Unable to boot PC after installing new graphics card
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