Is my power supply dead?
Initially noticed morning after a lightning storm - iMac worked fine prior to this.
First 3 diagnostic LED's are lit, but display back-light doesn't turn on. There's also no start up chime sound, but hdd seems to spool up, and white LED is on.
No visible signs of damage to power supply, but want to confirm output voltages. Are ps outputs +24v & +12v only?