mrh@Shasta.STANFORD.EDU (Marc Hannah) (09/10/87)
After 5-6 hours of consecutive work last night with my Mac II (with no problems after 2.5 months) I ran into problems booting this morning. The first time I powered on I did NOT get the Boot Chime and none of the usual procedure occurred. The screen was lit but nothing happened, neither the interrupt button nor the reset button (!) nor the 'power' button in the very back had any effect. Only by using my power strip was I able to try again. After a couple of power cycling attempts the system booted normally and seemed to behave ok. I tried a couple more times and it seemed flakey, including one time where it got pretty far in the boot process and then a 'click' came from the speaker and then it hung. I have seen problems with bootup when SCSI devices which were not on at bootup but only my internal hard drive was connected at boot time and even one of the times when it was read properly, the system hung. Obviously it looks like a hardware problem and I'm taking it in for (warrenty) repairs but I thought I'd post to get feedback and other people's experience. David Gelphman daveg%slacvm.bitnet@forsythe.stanford.edu
mday@cgl.ucsf.edu (Mark Day) (09/10/87)
In article <2005@Shasta.STANFORD.EDU> mrh@Shasta.STANFORD.EDU (Marc Hannah) writes: > > After 5-6 hours of consecutive work last night with my Mac II (with no >problems after 2.5 months) I ran into problems booting this morning. The >first time I powered on I did NOT get the Boot Chime and none of the usual >procedure occurred. The screen was lit but nothing happened, >... Obviously it looks like a hardware >problem and I'm taking it in for (warrenty) repairs but I thought I'd post >to get feedback and other people's experience. Apple sent out a service alert on 8/27 with regards to an intermittent problem during the bootup sequence of a Mac II equipped with an internal 20SC. I don't know if your drive is 20 meg, but if so it may need a new drive EPROM. Quoting from the Apple Alert: "To locate the drive EPROM on the hard disk's PCB, look for the only rectangular 28 pin chip. In front of the chip (the side facing the 50 pin connector) the location U12 is printed on the board. Once the chip has been identified, look for the revision number on the chip's label under the heading 'E-P'. If the revision level is 2.6A the chip should be replaced." The drive EPROM chip is Apple part number 927-0002. Hope this helps those folks out there lucky enough to have a Mac II to have problems with. Mark ---------- Mark Day UUCP: ..ucbvax!ucsfcgl!mday ARPA: mday@cgl.ucsf.edu BITNET: mday@ucsfcgl.BITNET
chow@batcomputer.tn.cornell.edu (Christopher Chow) (09/10/87)
Actually, the Mac II beep on bootup is part of a self-test which the Mac II does on power-ups. Supposely, you can tell what's wrong with the machine by the beep sound it make - the beep sound code was written to assume that even main memory might not be there! Does anyone know the mapping between boot sounds and hardware errors? Christopher Chow /---------------------------------------------------------------------------\ | Internet: chow@tcgould.tn.cornell.edu (128.84.248.35 or 128.84.253.35) | | Usenet: ...{uw-beaver|ihnp4|decvax|vax135}!cornell!batcomputer!chow | | Bitnet: chow@crnlthry.bitnet | | Phone: 1-607-253-6699, USPS: 7122 N. Campus 7, Ithaca, NY 14853 | | Delphi: chow2 PAN: chow | \---------------------------------------------------------------------------/
loucks@intvax.UUCP (Cliff Loucks) (09/11/87)
in article <2005@Shasta.STANFORD.EDU>, mrh@Shasta.STANFORD.EDU (Marc Hannah) says: > > > After 5-6 hours of consecutive work last night with my Mac II (with no > problems after 2.5 months) I ran into problems booting this morning. We just got a Mac II with a 20Mb internal disk. It boots inconsistantly. The dealer said something came over AppleLink concerning (I think) a rom problem associated with the 20Mb units. Our machine will usually boot with power cycling; only once did it get into a state where the power switch in the back wouldn't do anything. -- Cliff Loucks [gatech | ucbvax]!unmvax!sandia!intvax!loucks Sandia National Labs, Albuquerque, New Mexico Poor New Mexico; So far from Heaven, and so close to Texas.