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The iBook G3 was unveiled in July 1999 as Apple's portable computer for consumers.

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can hear it power up, black screen

turn on the power button and can hear all the normal sounds just has a black screen

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Try connecting to an external display, if that works replace the display. If that doesn't work it could be the logic board.

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I'd try the cable between the logic board and the display first.

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If you have not tried PRAM reset holding down [command] + [option] + P + R

Make sure it is powered on and use a flashlight and shine it through the logo on the back. Press the keys for launchpad or dashboard so you know something would be on the screen. When you shine the light through the logo if you can see anything, desktop, launchpad or whichever you attempt to open then it is an issue with the sleep sensor. Sometimes this is a silly fix but just slowly try and shine the light at all angles through the logo, I had this happen to me and the flashlight trick got it to come out of sleep mode. Otherwise let us know how it went.

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follow up question to QEII Student IT:

same problem hooked up external monitor, got secondary display and mouse but no dock or bar or anything now what? how do I mirror the secondary display?

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