I have a D915PDL motherboard with a P4 3.2Ghz 540 processor. It recently died. I replaced the PSU and case. Nothing turns on. Can the CPU cause the system to not turn on, or because nothing turns on, not even the fans, is the motherboard bad? The only indication that there is any power is the "standby led" on the motherboard is lit.
The most accurate troubleshooting to narrow the issue is swapping components (CPU, motherboard). Test the system without memory looking for beep codes; if no beep codes you may have a dead board. You can also follow the next troubleshooting guide: