Hi Paul,

We had a problem like this with a iMac G5 and we concluded it was a logic board issue.

It took a long time to boot and lots of red dots appeared on screen before it froze.

Try running an Apple Hardware Disc to see if your logic board is broken

[quote|QEII Student IT]Hi Paul, We had a problem like this with a iMac G5 and we concluded it was a logic board issue. It took a long time to boot and lots of red dots appeared on screen before it froze. Try running an Apple Hardware Disc to see if your logic board is broken[/quote]

QEII Thank-you

[quote|paulrapid]QEII Thank-you[/quote]

Can I use the monitor from the G4 iMac without the logic board by make another base and connector to connect to say a mac mini?

[quote|paulrapid]Can I use the monitor from the G4 iMac without the logic board by make another base and connector to connect to say a mac mini?[/quote]

Used Apple Hardware Test CD and all passed, Ram, Logic board. Still the video screen has lines and jumps but I can see the Desktop and work ! What next?

[quote|paulrapid]Used Apple Hardware Test CD and all passed, Ram, Logic board. Still the video screen has lines and jumps but I can see the Desktop and work ! What next?[/quote]

Sounds like the video cable or screen- (laptop screens do this all the time) if replacing the screen is beyond your ability sounds like you may have a "parts" box.

Look here [http://www.mac-pro.com/Mac-Pro-Online-Store/G4-iMac-Parts-Flat-Panel-700Mhz-800Mhz}

BTW you can buy a just an LCD screen many places online once you have the pertinent data off the back of the display.

Good Luck,

N.

[quote|machead3]'''Sounds like the video cable or screen'''- (laptop screens do this all the time) if replacing the screen is beyond your ability sounds like you may have a "parts" box. Look here [http://www.mac-pro.com/Mac-Pro-Online-Store/G4-iMac-Parts-Flat-Panel-700Mhz-800Mhz} '''BTW you can buy a just an LCD screen many places online ''once you have the pertinent data off the back of the display.'' ''' Good Luck, N.[/quote]