a friend gave me a non-working iMac G5 iSight 17". the symptom: when the power switch is depressed, the fans (both the optical drive and CPU) come on, and the front panel pilot light comes on. after 30 or so seconds, the fans kick into high speed, then intermittently return to normal speed, then high speed.
there is no startup chime nor anything on the display. i inspected the display with a flashlight and there appears to be no image, so i don't think the problem is the backlight. using the excellent iFixit repair guide, i removed the logic board and checked for bad caps. all the caps look normal. i also checked the power supply caps and they are normal. diagnostic lights on the logic board: when the power is connected, led 1 lights as it should. when i press the power button, led 2 lights as it should. when the cpu overheats and the fans kick to high speed, led 4 glows red. from what i've been able to find online, there is no SMU reset button on this model. instead, i followed the instructions to reset the SMU by unplugging, wait 10 sec, then while holding the power switch on, reinsert the power plug. then release power and depress power again to start. that procedure did not help. finally, i replaced the CMOS battery on the logic board. is there anything else i should try before i give up? i hate to throw it away. thanks ken -- -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list --- You received this message because you are subscribed to the Google Groups "G-Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to g3-5-list+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
