Been experiencing problems with my imac lately – for no apparent reason it just switches off while I’m working on it. Sometimes it happens after the computer has been on for a few hours but on other occasions it has only been on for 20 mins or so. When it goes there is a clicking sound then the screen goes blank and the power indicator light goes out. Pressing the reset button has no effect and the only way I can get it to boot up again is to unplug it at the socket, leave it for at least 30 minutes then plug it back in and power up again. I’m worried that it seems to be occurring more and more frequently. I’ve run Norton Utilities and the hard drive seems fine. Any ideas as to what may be causing this?

Sounds like a problem on the analogue board. See if you can get an Apple Authorised tech to diagnose it, and see what they say. p

I have had the same problem. Took my Rev A Imac to local Apple shop. Here is the diagnosis: "Hardware test, verified voltage at powerboard and logic board both normal, recomment replacing AV board (661-2080 - Board, Analog/Video) symptoms same as internal bondi project" They wanted $280.50 for the repair, and I declined. Bought a demo Imac from CompUSA instead, for $499. (500 mhz, 128MW mem., 16 MW V mem, slot-load Indigo, 20 gig hard drive, CDRW, OS 9 and 10.1 both installed) They also sold me an AppleCare extended warranty, which I decided I needed, even on this demo machine. However, I'd still like to resurrect the little Rev A if I could. So, can anyone help with these questions: 1. Does this repair sound reasonable? It sounded to me like they could not be sure that replacing the A/V would solve it. (The estimate sheet contains a proviso that the seller "does not guarantee, whether expressed or implied that the above parts and labor will fix your computer.") 2. Does anyone know what is meant by the reference to the "internal bondi project?" 3. Is there another course available to me than replacing the A/V board? Thanks for any thoughts or experiences you might have had along these lines. Bill Chambliss (wchambliss@scc.state.va.us)

If you can find the part yourself somewhere else and feel comfortable replacing it, that should be a viable option. If you have a good TV repair shop local to you, you might try them as well. If they can diagnose the specific component failure, they can probably repair it at a reasonable rate. p