Hard Drive Light remains on even when system is powered off

HP xw8600 Workstation running XP SP3
In the past couple of weeks I am getting a lot of blue-screen errors with varying error codes, mostly pointing to problems with the C: drive. But what troubles me is that my hard drive activity light remains lit constantly, even when the system is powered off. The only way to make the light go out is to physically unplug the power cord from the computer. As soon as I plug the power cord back in, the HDD LED lights up.
I have Googled, Yahooed, and Binged this problem to death, and gotten nothing but pages and pages of why the hard drive would be busy when the machine is powered up. But powered down?
I ran HP's hardware diagnostics (found no problems, it never does) and have even disconnected the hard drive and moved it to another identical box (we have about 25 xw8600 boxes) and the problem did not follow. The HDD LED on this box remains lit with the power off and no hard drives connected.
I should note that the power light functions properly, I have checked the wiring and it's not backwards.

Hello WAVYTV, The symtoms you describe sound suspiciously like a faulty motherboard.
There may be a possibility that you could also have a faulty power supply.
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Please mark Accept As Solution if it solves your problem.

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Hard Drive Light remains on even when system is powered off

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