This means the display goes blank and the computer freezes. When the computer heats up and parts expand, the crack opens up and the power does not get through. One of the chips heats up and cools down each time the computer is turned on and off, so that eventually a small stress crack appears on one of the pins.
The 60G (1.2Ghz) “Early 2004” model and all the “Late 2004” model ibooks (1.2Ghz/1.33Ghz) and Mid 2005 (1.33 and 1.42Ghz) have different logic board (built in airport extreme)- but they still have the fault – even models with the new logic boards are affected! The “Early 2004” (1Ghz) models up until Oct 2004 have the same motherboard. The original 2003 ibook G4’s (800/933/1Ghz) have the fault. In fact the powerbooks from this era are a great design, the 15 inch Aluminium G4 powerbook is one of my all time favourite macs – I still have one. Thankfully the Aluminium power books don’t have the problem. The results are here and it appears that every iBook model can develop the blank display problem. I conducted a survey (thanks to over 300 readers who participated!) to see which model g4 ibook had the problem. This article describes the problem and how to repair it. You might think it is a problem with the display but it’s actually a problem with one of the chips on the main motherboard. It can appear after a year or more in some machines and the symptom is that after being on for a few minutes, the screen goes black (it looks blank, but the light has gone off), the fan turns on, and the computer freezes.
There is a problem with the logic board in the Macintosh G4 ibooks.
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