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? 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. Reseat the HD cables and power plugs. And reseat other drives (DVD or CDRW drive, Zip, etc). Make sure the PRAM battery tests good and is inserted correctly. Have a known good KB and Mouse attached. Do protect and test the GHz cpu. 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 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 Good luck! --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
