Safari and iMac go BANG !!!!

Question

Our ca. 2000 iMac G3 400 MHz DVD Special Edition is having some mental and visual problems. YES, we have over 150,000 plus miles on iMac
The picture and the sound go OFF suddenly while we are working on our computer; this occurs 3-4 times a day. It typically has occurred while using Safari. The Version no. is 3.2.1 the Build no. is 4525.27.1
I have downloaded and reinstalled Safari -- but it still keeps happening.
I will, for the SIXTH time in two weeks, be doing brain surgery on iMac. I will reset the PMU, check the battery voltage and perform other simple diagnostic tests to check the powering of the iMac.
Parts are no longer available for this iMac.
Any suggestions would be appreciated ..
Has anyone heard of this bug in Safari ??
Thanks
Samuel

Answer 1

Kenichi-
YOU A WONDER TO BEHOLD !!!!!!
THANK YOU, THANK YOU, THANK YOU !!!!!!!!!!!!!!!!!
If it occurs with and effects other apps, not just Safari, it is probably not something that is caused by Safari.
My wife and I have experienced this phenomenon ONLY with/on Safari -- this version and build 3.2.1 (4525.27.1) AND I think it started on our iMac after the last Update download and install. Prior to that NO PROBLEM !!!!!
Could it be a bug in Safari ?? How do I file a bug report to Apple ??
If you did the basics such as reset PRAM and run Repair Disk Permissions in Disk Utility, I would try creating a new admin user account in System Preferences Accounts pane. Log out and log in to the new account (don't use Fast User Switching). Does the same problem recur in the new account?
I have not done this YET, but I will. I thought that I would check my email first to see if I had any responses to my posting. We DO NOT use Fast User Switching.
Does this mean the iMac shuts OFF, or is it still running, but with no video or audio? How do you get the video and audio to come back ON?
The latter, green light is still ON, but NO video or audio. We turn off iMac with the "power button", turn off the power to the iMac at the surge protector and my wife's "trick" she pulls the plug from the wall receptacle. Then we wait a while: 10-20 minutes, plug back into the receptacle, turn on the surge protector and press the power button on the keyboard [ needs two presses ] or press the power button on the iMac. IMac then starts right back up, as if nothing had happened.
If it is shutting OFF, it may be the common analog video (PAV) board problem that affects CRT iMacs.
I thought that I would try attaching a fan to increase the heat dissipation, It sure looks and feels like a heat overload switch tripping. I took it to an Apple support place and they determined that there are not any replacement parts available.
Because of the economic recession=depression, we are reluctant to spend $2000+ for a new top-of-the-line iMac, which would be generally unusable for the next ten +/- years -- as this iMac has been for nine years. But if we must, I am looking at a 24" 3.06 GHz with 500 GB HDD.
Kenichi, thank you again.
Samuel