| Attachment | Size |
|---|---|
 Without RAM (8MB) | 525.29 KB |
| With RAM (8MB) | 4.35 MB |
I was recently trying to fix my 3.5" floppy drive. Plugged it in and the motor ran endlessly. Unplugged it from the IIGS and turned the IIGS back on and now it doesn't even boot.
Boot screen either goes to purple/green OR shows an endless set of question marks "?" OR shows random scrolling gobbly good.
Please help fix as I just got this ROM 01 IIGS and was so excited to get it going. Everything was working so perfectly. Thank you so much.
Any difference with a disconnected keyboard? If no -- RIP.
Thanks for your help!
No difference. Why would you say RIP when it was just working? Id like to better understand since Im shocked it just stopped. Maybe the ROM or RAM broke?
Is there a beep at all, or does it just go straight to the garbage screen? Will the self test run (hold down open apple and option when powering on)? I know models prior to the IIgs, no keyboard plugged in would trigger the self test, which is possibly why someone else asked. I'm not sure if that applies to the IIgs though.
Nope, Apple-option doesn't work. No real boot chime, as much as I can tell.
Any chance you plugged in the drive while the system was "hot"? Asking because that's amost 100% guaranteed to do what you describe.If not, have you verified you have a good power supply? And a working supply does not mean it's good.
I don't think I plugged the drive in while the systsem was powered on, if that is what you mean by "hot". I have not verified the power supply, but if it really was the power supply then why would it power on at all?
Undervoltage can cause things to partially work. It's an easy thing to check, and usually one of the first things looked at when vintage hardware is acting up. Make sure to check it under load/connected to the IIgs. You should be able to easily check it where the wires go into the plastic plug.
Okay. Could you explain how I would know if the power supply was good or not?
Measure the voltage. Of course, that assumes you have a digital multimeter (DMM) and know how to use it. Which I'm starting to think that was a faulty assumption.
I think I've got a DMM. Just being extra careful before I start poking around with my already-broken IIGS lol
Voltages (not under load):
-4.79
-10.89
11.32
5.14
This switching power supply uses a single high-frequency transformer to convert its primary voltage (around 350 VDC) down to each of the four output voltages. This configuration can't regulate each output independently: the feedback signal raises or lowers them all at once. Since +5 VDC is the most critical output that all the digital logic runs from, it is the most important voltage for controlling the feedback.
When you measure the PSU outputs without a load on +5, the feedback is effectively shut off by the +5 rail rising to its upper limit. In turn, this shuts down the primary side switch, which stops putting energy into all four of the outputs. The other outputs would be expected to be low under this condition.
So you do not think the power supply is the issue?
Impossible to tell without load test