Hp Pavilion HPE PC H8-1214 won't boot up after installing a Western Digital External hard drive

I just recently installed a 3TB Western Digital External hard drive to use for backing up photos and since then I am now having problems with my computer.
I will turn the computer on, but nothing happens.  The power button lights up, but the small stack of CD's that would normally light up on the front, while it is powering on, does not light up.  My monitor screen just stays blank and nothing happens.
If I turn off the desktop and unplug the external hard drive from the USB, let the the PC sit for 30 sec to 1 minute and then power it back on, it works properly.
PC is an HP Pavilion HPE PC h8-1214
Product #:  qw701aa#aba
Running Windows 7
Any advice would be greatly appreciated.

Thank you for your reply. I'll answer one at a time:
During these times when the computer seems to turn on but doesn't load Windows, do you get any type of image or error on the screen? Nothing appears on the screen at the time of boot. I don't even see the 'HP' logo or BIOS prompt.
Have you tried switching the power cable or testing the power cable in a different wall outlet (especially if it is plugged into a power strip, try it directly plugged into the wall). Yes I've plugged it into multiple outlets with and without surge protection with multiple power cables. The power supply doesn't seem to be the issue as it engages all fans etc.
If you've tried a known good power adapter in a known good outlet, it may be an issue with the power supply or a loose connection inside the computer (RAM, power, video card). I've re-seated all components, cables etc to no avail. I'm reasonably experienced in IT support and have never experienced an intermittent problem such as this.
The PC has been plugged in since I made my original post on 02/23/13. Each day I've powered it up to see if it would boot and had been unsuccessful. This evening, I walked by and hit the power button and instantly the drive 'disk' lights lit up, keyboard and mouse lit up, and it booted successfully (after 10 days of no luck). Now I'm afraid to shut it down b/c I never know when it will boot again. There are no system errors and it's running without any issues - until I shut it down again. The IT support guru's at my place of employment feel like it may be an issue with the motherboard since I don't see a bios prompt when this issue occurs. The unfortunate part is that I bought this re-furbished and the HP 90 warranty has expired...
Any further advice or troubleshooting assistance would be greatly appreciated!!

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