Re: G4 Powerbook 15"
I dropped the laptop and lost my wireless internet connection - airport was not longer found. I opened up the battery compartment to reseat the airport card and now that I've closed it back up and restarted, it sounds like it's started, but I get no display - it's completely black.
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Re: display won't turn back on
You may need to open it up again and remove first the airport card and turn it back on and if that boot your computer there's a possibility that your airport is causing the problem and the airport may be loose and touching some other parts on it.
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Cut the airport off and back on again. After that, delete any wifi profiles you have, and then re-add them. This will clear any corrupt profiles and troubleshoot that. If you can't connect to anything after that, check that the airport card is connected securely. If, after all that, it still isn't working, and other devices are able to connect to the same network, then your airport card is probably no longer working.
This is often a problem with Airport cards becoming defective over time. You mention that you have tried with an ethernet connection as well. When trying, make sure you disable your wireless connection. In addition, make sure that you are not using a static IP address or, if one is required, that you try assigning a different IP outside of your DHCP scope as you can be experiencing IP address conflicts.
What I would suggest is reseating the airport card as it may be the card has come loose or the cable is not connected properly. The following support page on the apple website will tell you how to do it.
Just remove ur CMOS battery and harddisk connection from motherboard. And then try to restart it will give u a msg no boot device or OS found.. Now reboot and add the CMOS battery and harddisk on motherboard...
your lcd probably just went out or the connecting cable just came loose(its in behind the lcd under the apple logo that lights up when you turn it on) if you open and close it frequently it will cause this
I had a similar problem with my 15" 1.33GHz powerbook G4. My problem was I couldn't connect to a network right away or at all, or wouldn't properly reconize the card (didn't drop it).
I solved it by removing the airport card from my PowerBook and putting it back into my G4. it should be in the same location. it's underneath the battery pack. 1. power off your G4 2. remove battery pack 3. there is a latch on the right side (if the charger port is facing down), open it 4. pull back plastic cover tab and gently remove the antenna plug from the airport. 5. pull the plastic tab, until the airport card is removed, keep out for 30+ seconds to ensure it erases any corrupt log file on card it's self. 6 place airport card into the slot again, fully inserting it, it should go 1/8" - 1/4" into your powerbook 7. plug in the antenna plug back into your G4's airport(it should click 2x(very lightly)), flip plastic tab back over top the antenna cord, close you latch. 8. place battery back into your G4 9. plug computer in, turn on and it should work if not then there is something wrong with the airport card reader, which i don't think it's the case here..