On Jun 1, 2004, at 9:53 PM, Tom and Lisa P wrote:
I have three 3400 motherboards exhibiting odd problems. Each of the three behaves the same: It can boot, it gets to the flashing disk, and goes no further. Oddly enough, neither the trackpad, nor an external mouse can get the cursor to move, but it accepts keyboard commands, such as power on, and PRAM zap. I havnt tried Open Firmware yet because I forgot the command.
I replaced the PMU chip on one with an identical part # PMU from a 5300, but nothing changes (same as it was before).
Anyone got any ideas ? I am particularly baffled that the keyboard input works while a mouse does not.
I *think* that's no mystery at all. IIRC, at a certain point in the boot process, even in a properly booting Mac, your mouse will be unresponsive for a little while -- the machine is attending to other things. I suspect that if you were to try booting from a CD or something, that you'd get cursor movement back. Regardless, since you've got no OS that you're booting from, you ought to tackle that problem first. (BTW, is there a reason why you replaced the PMU chip??)
- Eric.
I forgot to mention that no matter if I have the internal HD hooked up, or a bootable CD ROM (I havnt tried an external CD ROM yet....), it still hangs at the flashing disk. The fact it stops at a point is telling me something, but I dont know what.
Someone suggested exchanging the PMU chip as it contains the ADB function (IIRC).
Mad Dog
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