A new mainboard, power supply, and power switch should have gotten the 540s posting, provided there weren't bent pins shorting out one of the front USB ports.
An option is to move your XPS 8300 internals into another case, like an Antec Minuet.
A new mainboard, power supply, and power switch should have gotten the 540s posting, provided there weren't bent pins shorting out one of the front USB ports.
An option is to move your XPS 8300 internals into another case, like an Antec Minuet.