HP Elitebook 8560p Won't Shutdown

In short - I replaced the DVD drive with a hard drive and now the laptop won't fully shut down.

I just got the Elitebook 8560p a week ago and have been very happy with it so far. Did a couple of upgrades right away since it was a fairly low-specced model from Microcenter. Added an extra 4GB RAM stick - no issues. Replaced the built-in 500GB HDD with a 128GB Crucial M4 SSD, and did a clean Windows install - no issues. Removed the DVD drive from the "Upgrade Bay" and replaced it with the original 500GB Toshiba HDD to use as a secondary drive. Wiped all data on it and replaced with a single empty NTFS partition.

This is when I started having problems. The drive works great, and there are no noticeable errors when using the system. However, when I attempt to shut down the computer (Start -> Shutdown) Windows shuts down but the computer won't. The screen is completely blank, but the lights are still on and the fan is still spinning. I accidentally left it this way for a few hours and when I got to it the case was very hot (usually never heats up, even during heavy usage).

When I choose "Restart", it works correctly about 50% of the time, and the other 50% it hangs again. Shutdown always causes it to hang, requiring me to hold down the power button to fully turn it off. When I boot up again, if gives me the "Windows did not shut down properly" message with options for Safe Mode. I've already made sure all my drivers are up to date. I'm using the F.20 BIOS (don't want to update to F.22 due to SATA speed limit bug). Any suggestions?

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HP Elitebook 8560p Won't Shutdown