about 3 days ago i upgraded the hdd in my ibook to a 160gb seagate momentus. no problems for about 24hours.
and then it started crashing when i picked it up too fast, so then i moved it around very carefully, this helped but it would still crash. after one of the crashes it rebooted without wifi, checked hardware profile and it says no airport card. reboot 2-3 times and it's back. crash again it's gone. this continues for about 4 hours, then i go to sleep. wake up this morning and cant get wifi no matter what i do. have reset pram, nvram, pmu and run hardware diagnostic tool all several times. no help.
i would like to say the card is busted. but it is an airport and bluetooth card in one. and i have been having no problems with bluetooth! connects to my mouse and phone without any problems.
I would open up the book and double check all of your connections, sounds to me like something is loose. Pay special attention to the hard disk, not only its connection but the mounting bracket around it as well, make sure its properly oriented with the brackets in the correct position etc.
my guess that for some reason or another... the logic board has decided to die. not gonna complain, because everything was working fine before i opened her up to put the new hdd in. guess i'm gonna take her apart and sell for spares on ebay.
Is it in bits now? If it consistently powers on when disassembled, then you are probably missing something simple. Its rare that iBook boards fail to the point of no activity. Use the caps lock light to check if its powered on or not. If you get no light, it could be a problem with the power switch or the DC board. Both easy/cheap to fix.
Engineers use what we call a minimum system to troubleshoot faults. Disconnect airport, HD, optical drive, modem, keyboard, leave out the battery and the top case. You won't get a chime without built in speakers, but you can use a USB optical mouse to check for power, headphones for a chime. Using ports on the board is probably OK for testing here. Try with and without the screen connected, use external video if possible. You can power the unit on by poking something metal into the socket the power button connects to (gently).
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