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GX520 Will Not Boot Past Splash Screen

Dell Optiplex gX520 will not boot beyond the splash screen.

Unable to go into the BIOS; computer does not acknowledge keystrokes on the keyboard so pressing the F2 does not work.

There are not post code beeps.

The lights on the front panel are 1 and 4. Both are green. Dell's online diagnostic for lights does not include a description or explanation for this pattern.

Also, the floppy drive light is lit up green, and running, though there is nothing in the floppy drive.

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jawa29
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Further troubleshooting:

Opened the tower, disconnected the floppy drive, the hard drive and the CD drive. Computer still freezes at the Dell Logo screen, F2 and F12 still do not work, and the diagnostics lights are 2 and 3, which Dell say indicate a hard drive or floppy drive failure.
Additional troubleshooting:

After disconnecting all drives, I was able to get to a screen that says:

Alert! Previous attempts at booting this system have failed at checkpoint [Ithr].

In my previous experience, this has signaled the end of the line for these models (they are no longer under warranty, so replacing the motherboard is not feasible). Is this a motherboard problem, or possibly a power supply problem? Or is it time to get the user a new desktop?
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If any USB devices are plugged in to any USB ports, the computer freezes at the splash screen.

I can only get the error message if all devices are unplugged.
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