iMac (Slot Loading) startup problem

When I try to power it up I hear a "thump" and some cracles (the sounds come apparently from the CRT).
Jussi Hagman wrote on :

Hello,

I am having a problem with my iMac. I tried to google for advice but unfortunately I did not find very good advice yet.

My iMac switched itself off during use. It did not start up. After few hours of "rest" it did start up and work as usual, but the problem resurfaced after a few hours of use after that it has been more or less dead.

Now the iMac does not start up. When I try to power it up I hear a "thump" and some cracles (the sounds come apparently from the CRT). Nothing else happens No chime, no HD spin. The power LED does not light.

Is there anything I can do?

Another relating problem. A CD is stuck inside the machine. I thought pressing the right side of the slot with a paper clip would release the CD but I seem to be unable to get it working. Is this supposed to be working and if not how hard/dangerous is it to open the machine?

My Machine specs

Slot loading iMac 350MHz/512L2/640MB/6GB
Family Number: M5521
Firmware updated to latest (Most likely)
OS 10.3.x

Greetings, Jussi

Frank Perrey replied on :

Jussi Hagman jhagman@redacted.invalid wrote:

Is there anything I can do? did you check the PRAM-batterie? Are you switching off your iMac by unplugging it from power? (ac switch?)

Another relating problem. A CD is stuck inside the machine. I thought pressing the right side of the slot with a paper clip would release the CD but I seem to be unable to get it working. Is this supposed to be working and if not how hard/dangerous is it to open the machine? once you can start it should be solved by holding the mouse buttom pressed while starting (not sure it still works on 10.3.3, but that is the classical way to get rid of it) Greetings Frank

Jussi Hagman replied on :

Frank Perrey frank_perrey@redacted.invalid provided the following for the eyes of comp.sys.mac.hardware.misc:

Jussi Hagman jhagman@redacted.invalid wrote:

Is there anything I can do? did you check the PRAM-batterie?

Not initially, but now it is changed. No change :(

Are you switching off your iMac by unplugging it from power? (ac switch?)

No, not normally, but I have unplugged it completely while trying to get int running again.

Thanks for your advice, Jussi

Frank Perrey replied on :

Jussi Hagman jhagman@redacted.invalid wrote:

Thanks for your advice, ...more of it: Nothing else happens No chime, no HD spin. The power LED does not light. ...read it again. It looks very much like a termal problem (cold solder point f.e.) in your power supply. Don't you think that would make sense? The period when it was switching off by itself could be the point loosing contact when getting warm, finally it was too far away from contacting to work at all. The start noise could be the rest of the contact that breaks when power "starts flowing" (maybe some high voltage part ?) If I was you I would try to trace that.

Greetings from far south:-)) Frank Hannover/Germany