PowerMac G4 800 Quicksilver does nothing
Hi,
during the last weeks my old PowerMac just went off for three or four times, pressing the powerswitch boots it again and everything was fine again for some days.
This morning I got the same thing but it did nothing when hitting the power button.
No fan, no beep, no light – exactly nothing.
I reseted the PMU, took of the PCI-cards, removed the memory and tried another RAM, still the same.
The last thing I tried was removing the power cord, waiting some seconds, removing battery and waiting about an hour. Plugged the power cord back in, tried to boot, nothing.
As today is sunday I can't buy a new battery but I'll try this tomorrow, can this be the source of the problem?
Regards,
Friedrich
Hi, Friedrich!
Disconnect your peripherals. Disconnect the power cord, remove the battery, reset the PMU, depress the front power button for a few seconds, wait thirty minutes or so for the logic board's capacitors to discharge, then reconnect the power cord and attempt startup without the battery.
If no luck, then using a voltmeter, test the line voltage from the wall outlet through the power cord at female end of the cord. If the reading is normal, reconnect the power cord to the tower, open the side door, and use the voltmeter to test for DC trickle voltage coming from the power supply...
Here's a link to the PSU testing procedure you can use for your QS Mac. Please note that the only difference from the Gigabit Ethernet model test shown is that your QS should read +25 volts across pins 11 and 22, rather than the +28 volts shown:
http://docs.info.apple.com/article.html?artnum=95064
Here's a link with a color-coded pinout diagram for a Quicksilver (scroll down on the page) which will help identify the right wires to test:
http://www.xlr8yourmac.com/tips/MDDps_mods/MDD_PSMods.html
Test the power supply from the wire side of the power supply's harness where it connects to the logic board. Don't disconnect the connector from the board, but instead just insert the probes alongside the wires into the appropriate pin terminals and be sure to make metal-to-metal contact with the pins at the end of these wires within the connector. If the first test for trickle voltage reads zero voltage, retest to be sure that pin to probe contact was indeed made. If you still get a zero reading, your power supply is defective.
Gary
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Powermac G4 Quicksilver Mac OS X (10.4.3)Hi, Friedrich!
Disconnect your peripherals. Disconnect the power cord, remove the battery, reset the PMU, depress the front power button for a few seconds, wait thirty minutes or so for the logic board's capacitors to discharge, then reconnect the power cord and attempt startup without the battery.
If no luck, then using a voltmeter, test the line voltage from the wall outlet through the power cord at female end of the cord. If the reading is normal, reconnect the power cord to the tower, open the side door, and use the voltmeter to test for DC trickle voltage coming from the power supply...
Here's a link to the PSU testing procedure you can use for your QS Mac. Please note that the only difference from the Gigabit Ethernet model test shown is that your QS should read +25 volts across pins 11 and 22, rather than the +28 volts shown:
http://docs.info.apple.com/article.html?artnum=95064
Here's a link with a color-coded pinout diagram for a Quicksilver (scroll down on the page) which will help identify the right wires to test:
http://www.xlr8yourmac.com/tips/MDDps_mods/MDD_PSMods.html
Test the power supply from the wire side of the power supply's harness where it connects to the logic board. Don't disconnect the connector from the board, but instead just insert the probes alongside the wires into the appropriate pin terminals and be sure to make metal-to-metal contact with the pins at the end of these wires within the connector. If the first test for trickle voltage reads zero voltage, retest to be sure that pin to probe contact was indeed made. If you still get a zero reading, your power supply is defective.
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