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Okay, it's a good experiment to run, but the 750FX's BGA pattern would be different from the G3 installed in an iMac; that has a 360 BGA like a G4 PPC7400. Regarding the firmware, is the patcher joevt posted installed the same way as a PowerLogix or NewerTech patcher?

Sorry, I have a G3 750FX.

How cool! So, could the same swap be performed on an iMac G3 tray? I have a 750GX 900MHz processor on a faulty iBook G3 motherboard.

Thanks for the suggestions. I've performed the tests you suggested. I've cleaned thoroughly, tried pressing the 300-pin connector, the USB has power but no video, I've removed the EEPROM without success, and then put it back in. I performed another test, tried it on another GE that works fine...

I measured the Vcore and it's at 2.1v, which would be correct. I turned it on without a heatsink, and both processors get very hot, but it won't boot. The power LED is still off and there's no chime. I've noticed that the PCB is bulging downwards, I imagine from having the heatsink on it for so...

Thanks for your reply. I'll try to spend some time on it this weekend, but it seems like it's never been disassembled. When I put the single 400MHz chip in to test, it started right away without any problems. I'll try to check the Vcore to see if it's present or if there's a defect. I don't...

I bought it with that defect, and given the OS installed, I think it hasn't been used for a long time. OSX 10.2 The CPU board looks great, nothing's burned out, and the caps are made of tantalum. I'll take a closer look tomorrow.

I didn't explain myself well. I received an original, unmodified GE Dual 450MHz from the factory. All GEs accept duals; only the early Sawtooth models are incompatible. The CPU board seems defective, but I don't know how to find out what's wrong.

Hi, today I received a G4 Gigabit Dual 450MHz. When I press the power button, it turns on, but the power LED stays off, there's no chime, and it won't boot. I suspected the CPU and installed a Single 400MHz, and it booted up fine, with the power LED on, but no chime. I don't know if this is a...

Do you have a voltmeter to measure the voltage across these capacitors?

Can you post quality photos of both sides of the processor card, without the heatsink? We'll try to locate the voltage regulator and see what Vcore it's set to. And a photo of the processor's inscription. The factory heatsink is too small, less efective.

@herd, looking at the 7410 and 7447 datasheets, the 7410 has A[0-31] and the 7447 has A[0-35], so the 7447 has four additional pads. How can it work on a 7410 socket? The same goes for other pads like AP or DTI.

Yesterday I was reviewing the PDF for this processor, and I believe it does have an L3 cache, but there are only jumpers for selecting speed; you can't adjust Vcore without a soldering iron. If changing the airflow doesn't improve performance, try lowering the processor speed a bit. If the...

I would run these tests: * Remove thermal pad, clean and add good thermal compound, like herd said. * Turn on the rubber fan and the CPU fan. * Disconnect the additional fan under the optical drive. Check the temperature. If it's still high: * Lower the CPU voltage by 0.05V or 0.1V and see...

Hi, I notice a detail: the fan under the black rubber. The original QS fan is upside down. It should be drawing air in, not out. The 12cm fan below the tower draws air out. Try also reverse the CPU fan.

Okay, I'll try that first. When he brings me the CUBE and checks it out, I'll let you know what I find. Thanks.

I don't want to take any credit away from Artmix; on the contrary, I know it won't be comparable to their work. And I'm not suggesting buying it on Aliexpress either; those links were just examples. I usually buy PSUs and similar items from local computer stores; I wouldn't power a Cube with a...

Sorry, I included a couple of Aliexpress links as examples, but they're sold everywhere. I've attached some photos. They're typical PICO PSUs, and they come in different power ratings. I'd just need to know where to buy the CUBE VRM connector to adapt them to the motherboard. And with a...