Hi all, I have an old Mac 512k that I pulled out of storage, and it has an odd problem when it boots. When I flip the switch, I hear no "startup chime", but I do see a perfect-looking "happy mac" screen, and the floppy drive starts going. However, it isn't actually trying to boot the disk. It just starts the motor spinning, but the read/write head never moves. The mac will sit in this "happy mac" screen forever.. it never gives up, and won't display the flashing "?" (like it does if it can't find a boot disk). It just hangs at this just-before-reading- from-disk phase.
Things I have already done, with no change in behavior: * Removed and cleaned the drive (incl. read/write head) and even swapped it with another working 400k drive. * Fed it numerous working 400k boot floppies * Tried booting with the floppy drive disconnected (same results) * Removed ROM chips, cleaned contacts & put back * Cleaned the logic board, checked all the solder joints. * Checked the solder joints on the analog board, esp. the speaker. I suspect this is a logic board issue (maybe ROM or RAM chips?), but I'm not 100% sure because of the "no chime" thing. I sort of thought that you couldn't get a happy mac if there was no chime? Any ideas what could be causing this? I can take pictures of components if it will help. Any suggestions are greatly appreciated!! Thanks a bunch, Tim -- ----- 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 vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
