black screen, can hear it power up
imac 20" mid-2007 aluminum EMC2133 - black screen. LED1 ON before (plugged) and after start, no chime sound, LED 2 and LED 3 ON right after start, goes OFF momentarily, fan stops, all come ON again shortly after. LED 4 OFF all the time. Can hear HD, Optical DR after start. Intermittently when started screen comes up for 1 sec and then goes black. 1 out of 20 times. Replaced the logic board. No change. Replaced HD. No change. is this a power supply issue? thanks.
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