I've got two iBooks that are very different. One is a 466 MHz clamshell, the other an 800 MHz 12" iceBook. Both seem to have an identical issue. These iBooks have very different video cards. The 466 MHz has an 8 MB Rage Pro. The 800 MHz has a 32 MB Radeon 7500.
The problem is that if either is booted normally they often come up black screen, the LCD has nothing, but the boot completes normally, and if you press the Power key followed by the Return key they will shutdown normally. Resetting the PMU or resetting the PRAM/NVRAM has no effect. Most "normal" boots result in a black screen. Strangely, most verbose boots, either by using the Cmd-v keys at startup or setting the verbose flag either in Terminal or Open Firmware results in a normal boot with the LCD functioning "semi- normally". I use the term "semi-normally" because there are some lines and artifacts that will sometimes streak the screen a little, but quickly go away. I'm thinking the video cards may have bad VRAM, or "slow" VRAM, but I don't know, it's just a guess. Both have 10.4.11, but these symptoms seem to be independent of the OS. The clamshell has OS 9.2.2 on a separate partition and it sometimes boots black and sometimes boots normally. The normal boot never turns black while in use, so it's not likely a cable issue. I think some small electronic part may be burned out - there is a very faint smell of burnt electronics on both these iBooks. Any ideas on why two very different iBooks would seemingly have identical issues? Solution? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's G-Books list, a group for those using G3 iBooks and PowerBooks (we run a separate list for G4 'Books). The list FAQ is at http://lowendmac.com/lists/g-books.html and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g-books?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
