@ Brad McCartney & D. Finnigan: Thanks for the tip, guys. It helped me remove the PRAM battery cage.
I thought I would try to switch out the PRAM battery from a less old Mac (PowerCenter Pro 180 clone) and test it in the Centris 610. No change. Probably because that PRAM battery is dead too. ------------------------------------------------------ I read the following on this web site (http://macfaq.org/hardware/ logicboard.shtml): "The Centris 610 and its later variants (C/Q 660AV, Q610, Power Mac/ Performa 61xx) will also fail to output a video signal when the PRAM battery dies (or if no PRAM battery is present, or if it's inserted the wrong way). There is no known workaround for this problem; you'll have to replace the battery." If this is correct, I wonder why my Centris DOES output video. It displays the ? Disk icon and mouse arrow. I mean, I'm glad it does, but it leaves me confused. I also read the following on LEM: "A dead or low PRAM battery can prevent a system from booting or can cause erratic boot behavior; this is particularly common with laptops. If a replacement battery is not available or the battery is inaccessible, plug in the AC power adapter and leave the computer charging for 30-60 minutes. This often recharges the battery enough to permit booting. If an hour doesn't work, leave it plugged in overnight and try the next day." So I tried leaving the Centris plugged in overnight. No change. I guess the PRAM battery is beyond help. Like Ken Daggett said, "dead as a doornail". Guess I'll have to suck it up and buy a new PRAM battery. -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.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 leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
