Re: Dimension E520 Windows 7 will not boot
Disconnect the "music" keyboard and any other USB devices and hubs except the regular mouse and keyboard. When you power on the PC, press F12 and then run a complete diagnostic and see if anything turns up (this assumes you still have the Dell diagnostic partition). Look closely at all of the USB ports for any bent or shorted pins as this was a reported problem on a Dimension E510 that would not boot.
A long shot, the MIDI keyboard or controller could have caused the initial problem. I have a Roland PCR500 MIDI keyboard but it has an updated Win 7 64 bit driver.
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