Dead LC 580

[Quadraman]

I just got a LC 580 that won't power up. When I turn on the power switch, I can hear the CRT crackle, so I know that is getting power. I have moved the motherboard and hard drive to another computer, so I know they both work. I cleaned all the dust and fuzzballs out and checked all the connections were hooked up. What can be the cause of power going to the screen but not the motherboard??

 

[Maniacintosh]

It is most likely the motherboard connector. Macs with slide-out motherboards can be extremely tempermental. I've had to slide out and shove in the motherboard ten times before I could get it to power on correctly on one of my LC 580s. Vacuum it out again and keep trying...