At 9:46 AM -0400 10/4/08, insightinmind wrote: >On Oct 4, 2008, at 12:30 AM, Bill Christensen wrote: > >> >> Update: >> >> The power supply itself checks out. Voltage is good for all pins, >> including the blackend ones. >> >> I'll check various other components separately on another machine >> (processor, RAM, cards), but assuming those are working does anyone >> here know how to diagnose a mobo? >> >> >> original msg >> ---------- >> >> Hi all, >> >> Looks like I have a problem with one of my 'teeth. >> >> It wasn't powering up properly - would start to come on then die >> before any drives came up - and in the process of looking for the >> problem (suspected power supply) I found that three pins on the P1 >> power connector are blackened. All are +5 volt (pins 6, 19, and 20) >> according to >> <http://www.xlr8yourmac.com/systems/ATX_G4_AGP_conversion/ >> G4_AGP_to_ATX_case_pg2.htm>. >> >> Which is the more likely culprit, the power supply or the >> motherboard? I don't want to risk blowing my spare power supply, or >> the dual 1gig processor on the board for that matter, by cooking >> something further. I see no other obvious signs of trouble. No >> charred parts or places where smoke has escaped. >> >> Obviously I need to dig around and find my meter (I think I hid it >> from my 7 year old last time I put it away and now don't remember >> where) to see if the existing ps is still functional. And i'll >> probably swap the processor for an old 450 single and put the 1gig in >> a different sawtooth to test it. Any other suggestions on how to >> proceed? >> >> Thanks. >> -- >> Bill Christensen >> <http://greenbuilder.com/contact/> > >No advice on the mobo itself. (Far from being an expert). Did you >have a power fluctuation or nearby lightening strike recently?
All our machines are on a big honking UPS. And their ethernet connections are surge protected as well. > >This is what I would try: > >I would probably remove all PCI cards ... Sawtooth has an AGP card? >Leave that in or move in a "fresh" known working one. Have a bare >minimum amount of RAM ... maybe trying different slots. A bare >minimum hardware setup. That's the plan. > >Reseat the HD cables and power plugs. And reseat other drives (DVD or >CDRW drive, Zip, etc). Good point. Hadn't done that for everything yet. > >Make sure the PRAM battery tests good and is inserted correctly. Done > >Have a known good KB and Mouse attached. Right. > >Do protect and test the GHz cpu. I've got to free up a machine to do that on, will probably do that this weekend. > >Find the answer to: Can a mobo damage a psu? > >Blow out all the dust in the unit as well as in the psu. Recommend >taking it outside ... it can build up in there! I keep 'em pretty clean. This one could use a light dusting though. > >I found this site for Apple psu-s (although I haven't purchased any, >yet): >http://www.dvwarehouse.com/Apple-Power-Supply-c-253_247.html? >gclid=CIrvnOGOgpYCFQNfFQodwCYEEA > I actually just purchased a spare last week from LEM Swap, so that's covered. -- Bill Christensen <http://greenbuilder.com/contact/> Green Building Professionals Directory: <http://directory.greenbuilder.com> Sustainable Building Calendar: <http://www.greenbuilder.com/calendar/> Green Real Estate: <http://www.greenbuilder.com/realestate/> Straw Bale Registry: <http://sbregistry.greenbuilder.com/> Books/videos/software: <http://bookstore.greenbuilder.com/> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, 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 [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
