Take it back out and see how it goes? If it works, go into the BIOS and make sure it is set to allow 'auto' or 'detect' graphics output method. It might still use the onboard output. You could try ...

The hidden recovery partition on your HP computer lets you restore your business machine back to its factory default condition. The recovery program resides on its own partition, so it is accessible ...

Hewlett-Packard regularly releases BIOS or firmware updates for its Pavilion line of desktop systems and recommends that users update the BIOS on the machines if experiencing problems. In most cases, ...

Its probably just the boot order. Go into the BIOS and make sure its trying to boot from the correct hard drive first. If you aren't sure what drive you are supposed to boot from, just switch whatever ...