<!-- from fixya rte -->How do I take apart my imac? - Apple 24" iMac Desktop

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ifixit.com has wonderful guides. You'll have to take apart the entire case to get to them. Parts should be relatively cheap too, since the machine is so old.

Check your VGA connections (screen to desktop) then try a different screen (if available) if these fail then it might well be your graphics card, not unheard of with Apple, or so I'm told. Try another card if the machine allows that, preferably borrow or beg one as Apple stuff is expensive.

Checking the power supply isn't the easiest thing to do, it involves pulling apart the entire machine.
You can try resetting the SMC, unplugging all power, hold the power button for 5 seconds, replace power, then attempt to turn on.
if it still won't turn on, and assuming you didn't get AppleCare or it is expired (past 3 years) it might be worth taking in to an Authorized Apple Repair Facility and see if they will check it out for free. If it is under warranty, most definitely take it in or call 1-800-APL-CARE
If neither of those are an option, Power Supply http://www.ifixit.com/Apple-Parts/iMac-Intel-24-Inch-2-4-2-8-GHz-or-3-06-EMC-No-2211-GHz-Power-Supply/IF169-002
a tear down from iFixit for the 20" model, it is most likely very similar for your model as well http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-20-Inch-EMC-2133-and-2210-Power-Supply/1006/1
Hopefully that helps. Good Luck

Please have a look at this link : http://www.scribd.com/doc/103447/iMac-G3-Disassembly-Guide
it's a manual for disassembling the iMac G3. You can use this manual to take apart your computer and fix your batter in it.
If you have any problems in getting it done, please let me know.
Hope this helps, Best Regards
NextDoorNerd

Are you sure the iMac is really shutting down or just turning off the backlight? The tell-tale sing would be to let the unit fully boot-up (wait 3 minutes) and the press the button the apple keyboard that ejects the CD-ROM. If the CD-ROM door opens, you iMac is running with disabled or broken backlight.
The inverter circuit on the iMac G4 is known to be weak.
There could be another problem, though. The iMac G4 is also known to have weak internal power supplies. Here's how you can tell:
Hold down the CMD OPT "O" and "F" keys at the same time while pressing the power button. This will tell the iMac that you want to boot into the Open Firmware shell, bypassing the Mac OS X startup. If this works, your power supply is good, the inverter is good and you have a problem with your Open Firmware boot string. To fix the boot string, Power on the unit while holding down the keys CMD-OPT-P-R to zap the parameter RAM (PRAM) and reset everything to defaults.
If you were not able to boot into the Open Firmware shell, your problem is either a failed power supply or a failed screen backlight. The last possible culprit is your iMac could suffer from "Bulging Capacitor Syndrome", where a batch of iMac G4s, iMac G5s another electronics were fitted with a bad batch of capacitors. Eventually, the caps will rupture and cause irreparable damage to the logic board. Only way to verify this is to pull the unit apart and visually inspect. If you see little green or blue cylinders that seem to be bulging or oozing a thick oily goo, that's your problem. Only recourse is to shop around on eBay and look for a replacement logic board.

It would be very difficult to open up the imac to retrieve the disc as the CD drive is totally enclosed and would probably result in it not be functional after removing the disk. Have a look at the following article on the apple website
http://support.apple.com/kb/HT3007?viewlocale=en_US as it does indicate that the slot loading imac does have a hole for paperclip ejection. You could also try opening up disk utility and and clicking on the icon of your disk under the left hand column then go up to eject button and click eject. Hope this helps.

on the asus in the tool bar right click the wireless icon then choose view wireless a netwrok should appear then choose connect
if no networks appear on same page click to refresh network list once you have a network then click to connect.
I think the problem is diue to interference as you said you live in an apartment.
You can get a better router system or have someone come in and configure the one you have and make it a secure connection with password

ask an apple technition

It sounds like you managed to turn on the Universal Access inverse image setting.  Try hitting ctrl-option-cmd-8.
For future reference, go to the Universal Access pref pane under System preferences.  
I hope that helps.