Registered: 11/15/07
Posts: 1797
Loc: Florida, USA
I have a digital audio im trying to get working again. I think the CPU is dead but to make sure will the system power up with out a CPU? As in just enough for the power supply to kick on?
The G4 will not power on without a CPU. The best thing to do is to test the power supply by itself. Take a small piece of wire and jumper it from the green wire (power on) and a black wire (ground). That will make the power supply kick start without being plugged into the motherboard. But you have to have the power supply plugged into the wall outlet of course.
Registered: 11/15/07
Posts: 1797
Loc: Florida, USA
I know that much of to test a power supply. Guess my CPU is dead or the motherboard is dead. If I can locate a different motherboard I can find out for sure.
Wait a sec, a digital audio CPU can work on a sawtooth logicboard but I would have to cut off the pins to the second IDE channel right?
Depends on the cpu. I have a 466 DA cpu set to 550 for a Sawtooth and i didn't have to take off the second IDE. Any single DA cpu's will work in a Sawtooth, they just need to be jumpered for the right speed setting. (ex 466 DA CPU would be 350 in a Sawtooth)
Here is a chart comparing the Sawtooth cpu's and the Digital Audio cpu's for jumper settings. The red highlighted part is where they differ in jumper speeds. Jumper settings
Ok, so by the sounds of it, you have one of the following... Either a 667, a 733 or a dual 533 cpu from a Digital Audio. In that case, yes, you need to remove the second IDE connector and use an IDE card.
Registered: 11/15/07
Posts: 1797
Loc: Florida, USA
I got the 733MHz CPU module. I went ahead and bit the bullet and chopped off the pins to the 2nd IDE channel and it doesn't work. No power will go to the system. I have checked the power supply 3 times and it works fine with my tester, even work on the sawtooth with the 400MHz CPU. So I guess I have a dead CPU.
Would a sawtooth CPU work on a DA or not. I know the DA uses a 133MHz FSB and the Sawtooth uses a 100MHz FSB.
It might, but be careful not to fry the cpu. You might have to down clock it a bit. A 450 might run at 600MHz without modifications but i would check it all first to be on the safe side.
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