Could be a bad memory chip. FWIW On Apr 1, 2014, at 5:33 PM, faithie999 <faithie...@hotmail.com> wrote:
> 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. -- -- 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.
