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Frozen Mac

By cuisine_teen ·
My PowerBook 1400cs is stuck, it seems to be on, but the screen is black. I've tried turning it off but it won't turn off. What else can I do?

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Frozen Mac

by pctech In reply to Frozen Mac


I do not work on MACS, but the principle is the same on the LCD screen.
Should the MAC have a connection for an external monitor, connect the laptop to an external monitor and see if you have a display. There may be a keystroke combination toswitch the video to external display, you have to check your manual to verify this. Should the external monitor work, the graphics chip is fine. The next possibilty would be a broken or loose cable trace for the display or the backlight is burned out. Any of these will require a repair shop, unless you have the knowledge to work on it. Very few repair shops work on the MAC. Since the problem is with the dispaly, most repair shops that work on laptops can probably help you troubleshoot the problem. Getting parts for it is another issue so they will probably turn down the job anyway.
Should you not get a display on the external monitor, you probably have a bad graphics chip. These are usually hard mounted ( soldered )and not replaceable. Result? A new motherboard. Cost? Probably not cost effective.

One last possibilty is a brightness adjustment that may have been turned down. Not all LCD screens were controllable this way and may not apply to your laptop.

I hope this helps.

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