On Friday, Apr 22, 2005, at 09:17 Australia/Perth, Paul Weaver wrote:

Can someone tell me the trick how to remove the top cover of a blue G3 slot
load iMac please.  I've looked on the web without success.

You don't.
You remove the bottom cover. Roll it over on a towel and remove its soft underbelly.
(should just need three screws undone and a bit of gentle prying).

This page may assist:

<http://www.macworld.com/2001/10/bc/howtoimac/>


HTH

Steve.