Imac screen is black

FYI i am not a mac expert by any means.
The screen is totally black but you can see the desktop in the background.
now if i unplugged it for a extended period of time the mac will boot up no problems but as soon as i restart it/ turn off and try to start if up again it goes right back in to the black screen.

All the sounds seem number on bootup.

i have tried to hold down the power for 10 secs to shutdown , then unplugged power cable and hold power for 5 secs. (read this some where)

any other ideas?

Btw i think it is a imac g5
jamyoungAsked:
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BoguezCommented:
1) UNPLUG THE LAPTOP
2) REMOVE THE BATTERY
3) HOLD DOWN THE POWER BUTTON FOR ABOUT 30 SECONDS TO 2 MINUTES
4) THEN PUT THE BATTERY BACK IN
5) START IT UP..
jamyoungAuthor Commented:
Sorry forgot to mention it's not laptop
BoguezCommented:
is the fan and hard rive working??
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strungCommented:
Try resetting the SMU as follows:

   1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
   2. Unplug all cables from the computer, including the power cord.
   3. Wait 10 seconds.
   4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
   5. Let go of the power button.
   6. Press the power button once more to start up your iMac.
strungCommented:
If that doesn't solve your problem, the clock battery may need replacing:

http://www.ifixit.com/Guide/Repair/Installing-iMac-G5-20-Inch-Model-A1145-PRAM-Battery/1153/1
BoguezCommented:
Here's a link but do not try this if you are not sure you can do it:

http://support.apple.com/kb/TS2094
roylongCommented:
1. what do you mean you can see the desktop in the background?  Do you mean burn in on the screen, or a faint image?
2. Did you try pressing the brightness up on the keyboard?  I know it sounds dumb but I have dimmed my mac before and almost gone spare trying to work out the problem before realising and turning up the brightness!
jamyoungAuthor Commented:
Yeah I tried. The brightness. The hard drive and fans.  Run you see the desktop in background but faded. I can see pointer move.  I think I tried doing smu but Will try again again in morning.  Thanks for reponses
roylongCommented:
Sounds like it could be a problem with the backlight on the screen, may need replacing.

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mccrickCommented:
i second that
jamyoungAuthor Commented:
yeah i was kinda of thinking along those lines too. Now is that something that i can do? if so you have a link?
kpliew1Commented:
Inverter board spoilt, send for repair
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