What does that screen mean? I have such bad luck. :'(

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Looks like it could be a power supply issue. The lines are probably the brightness turned up too high.

Also, for SimasiMac you are looking for the caps on the motherboard. The ones in your pics are of the power supply.

This link shows you exactly what to look for: http://www.teamteabag.com/2008/04/21/retro-computing-corner-simasimac-fix/