Re: booting hang up
i wouldn't just unplug the hard drive. unplug all of the non-essentials so you only have CPU, RAM, PSU, and (if needed) video card. THen like rudster said boot up and see if it goes to "Non System Disk" or what ever error your particular board gives you.
if it does give you the error. start re-attaching parts. do one at a time and reboot untill you can nail down the problem.
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