>My MacLab has inherited a 7100/100 with 2 external SCSI drives and an Apple
>20" monitor.
>
>When I tried it out, the monitor power light stayed green for a few seconds
>and then a yellow light came on and the screen stayed blank. I kept fooling
>around with it, but it was hard because I had no way of knowing for sure
>what the system was doing because I didn't have a monitor.
>
>The good news was that eventually the monitor came on and I saw that the
>system had booted to OS 9.1. I played with it briefly and then powered
>everything off for the day. Today I had a few minutes to experiment so I
>pushed the cart into place and turned everything on. Once again the yellow
>light came on and the screen stayed black. I reached around the back of the
>system to check the connection and realized to my horror that I had
>unplugged the SCSI cable.
>
>Now, with everything turned on, the system locks up at a blue screen and a
>frozen pointer in the upper left of the screen while it's starting up.
>Turning off the external drives lets it boot, but it seems to take a long
>time. Once in the finder, turning on an external locks up the system
>immediately. I haven't had a chance to test the drives on another system so
>I don't which part(s) might be damaged. Obviously, this is not good, but
>just how bad is this and is there anything I can do?
>
>thanks, jim
I think it's possibly unwise to power up the computer before the
external scsi devices - I've never used external drives but I think they
should be powered up before the system.
Best thing to do if it boots is fire it up with the externals off
and zap the pram a few times by holding down the command/option/p/r keys
after the boot chimes. Then restart again and rebuild the desktop by
holding down the command/option keys until you get the rebuild dialogue.
Then shutdown after the rebuild - turn on the externals first - and
startup again. If it boots have a look in the devices section of the
apple system profiler under the apple menu and check the scsi id's and
info the internal drive should be on scsi bus 0 id 0 and the externals
should be on scsi bus 1 with id's from 0 - whatever the limit is - 15?
If it boots but the externals don't show there may be problems with
the drivers for these and some diagnostic utilities may be required to
get them to mount.
Pete
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