Colour Classic Won't Start -- Need Help

clean the contacts with a small cotten swab and a little bit of rubbing alchohol. if you can get long enough swabs, try to clean the contacts on the receptor. that might take care of the problem

o_________O

might be a ridiculous question, but... did you try pressing the Power button on the keyboard after you flicked the switch on the back of the machine?

Cleaning the contacts inside the case seems to have done the trick. Now the only problem is that there is now sound. I know the speaker works because I hooked it up to a wave generator and it produced sound. I traced the speaker wires back to the a/b and didn't notice anything wrong. I haven't tried to see if the headphone jack on the back is working, but will try that when I get home.

tried the CUDA switch? that fixed a CC with exact the same behaviour. and maybe the sound will come back by doing so. you never know.

Hi all,

I have a dead Color Classic with somewhat similiar behavior to the original posters-

1. No PRAM battery so I assume that's not the problem.
2. If the logic board is out, then the machine will start up- I hear the fan and the hard drive spin up (so far so good).
3. But when I stick the logic board in, the machine shuts off completely (boo).

I tried cleaning the contacts on the board and the socket, but to no avail.

Would these signs point towards a bad logic board? I would love to get this unit working, but don't have any other Classics to troubleshoot with.

Thanks! Steve

MMM

Apple divides its power-control sytems into 'passive' (with nothing but an AC switch at the rear of the Mac to start it) and 'active' (with inbuilt power-control circuitry, and a so-called 'soft power' switch on the keyboard for startup, but no AC switch behind).

Of course there is an exception to this division, and the CC is one of the exemplars. It has an AC switch behind, and a soft power switch on the keyboard (if it has its original or a suitable alternative). Its power-control system is called pseudo-soft by Apple.

Given that you have cleaned and inspected the logic board and fan, inserted RAM and VRAM if those are missing, replaced the PRAM battery with a known-good half-AA 3.6V lithium cell (or a Rayovac 840 4.5V alkaline battery for MLBs of the CC's 'middle period'), checked that FDD and HDD are present and connected, and worked the logic board in and out of its connector several times to clean the contacts, and pressed the CUDA switch (near the ADB ports) if one is present, switching on the AC should give an audible resonant 'clunk', as of a relay pulling-in. Now the soft power key on the keyboard should initiate startup.

If, however, pressing the keyboard's power key produces one or more audible clicks, and blinks the front green power-on LED in sympathy for as long as you hold the key down, you have met a CC that has not been in use for quite some time. The remedy is to leave the CC set up, with the AC power switched on, for up to 24hr, trying at (say) hourly intervals to start up with the keyboard switch. If one of these attempts elicits the POST chime, you are on the way with a demonstratedly working logic board.

If you get the chime, you can apply all the usual responses to the failure to see the subsequent requisite 'mileposts', in order: screen raster, on-screen pointer, Happy Mac icon, splash screen, march of the icons, and finally, the Desktop. Listen (or feel) for signs of HDD spin-up, but be prepared for the possibility that a Disk Tools floppy disk may be needed to boot from, and perhaps to repair the HDD or reinstall the HDD driver.

If you do not get the chime within 24hr, which is rare indeed if the CC is capable of working, leave the CC another 48hr with the same regular checks. If you still get no joy, it may then be time to break out a larger hammer.

de