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iMac G4 Intermittent Screen Black At Startup

 
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Dino1956
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PostPosted: Tue Aug 16, 2011 9:52 pm    Post subject: iMac G4 Intermittent Screen Black At Startup Reply with quote

The Screen doesn't come up on my iMac G4 for 3 Boots in a Row. On the 4th forced Startup, Screen will come up perfectly. Sometimes it takes 5 tries. I attached it to an external Monitor & works perfect with an external monitor. Something graphically at startup is preventing the screen from coming on. I tried all in Settings System Preferences/Displays. I also tried PRAM Reset & Safe Mode. No Go! Once it finally boots up & loads the Screen, the screen stays on indefinitely. The screen looks perfect. I want to sell it & no one's going to want it like this. Smile
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Smithcraft
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PostPosted: Wed Aug 17, 2011 4:52 am    Post subject: Reply with quote

That seems like a tough one.

I would almost think it's a connection, but that's just grasping at straws.

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macmanmacman
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PostPosted: Wed Aug 17, 2011 5:57 am    Post subject: Reply with quote

First off it cannot be the graphic's card keeping the machine from starting up.

My guess would be your monitor is going or worse.

there are two version's of the iMac g4 do you have a lampie model or the thin model built all in one.

The reason i ask is if it is a all in one the power supply is going the only way to check this is check the board and power supply for bulging capacitors.

If it is a lampie it is the power relay board for the lcd that is going out.

Bad news both parts are no longer produced by apple which means third party vendors are your only choice and are your most expensive choice as well
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Dino1956
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PostPosted: Wed Aug 17, 2011 8:17 am    Post subject: Reply with quote

Thanks for the replies. The thing is, I can't believe it's a connection. Since once it's starts up, I can swivel & move the Screen anywhere & it won't turn off. I even tried moving the Base & it stays on looking perfect. This will run for days. It's ONLY at startup. Once I get the Screen to come on, the Screen stays on & never shuts off. Even when it goes into Sleep Mode. A wiggle of the Mouse, takes it out of Sleep Mode & the screen again looks perfect. Btw, It's the Lampshade Model. I guess you could leave it on all the time, but that's not ideal & certainly not a fix. It worked before this perfectly. The last month it's been doing this. I also tried clicking on "Detect Displays" in Sys Pref Display.
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Dino1956
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PostPosted: Wed Aug 17, 2011 9:18 am    Post subject: Reply with quote

@ Macman "If it is a lampie it is the power relay board for the lcd that is going out" If this is correct, would it eventually also effect it being used with an External Monitor? Thanks.
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macmanmacman
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PostPosted: Sat Jun 16, 2012 11:36 pm    Post subject: Reply with quote

True True it makes it harder to use as a external

there is another thing you can check though and it's really easy plug a monitor adapter into the lampie and try to start it up the the monitor connected to it goes to a gray screen its the lcd board if the screen stays black your graphics card might be failing

If the graphics card is failing you will get no response from the machine at all and once it displays on the screen try a reset from the apple menu if the machine comes back on and loads with the gray apple screen cool it's not the graphics card at all if it doesnt after the reset it is most likely the graphics card weird the mini g4 has the same failure i wonder if this is normal for the old machine
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