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Test your PSU or replace it if your power supply units fan is not working your PSU is faulty
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA
the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they are probably old and faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error
One bad lead will cause your computer to continue in a cycle replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA and the ones that attach from your motherboard to hard drive hope this helps
sound like you have a dirty hard drive first remove all the dust around your hard drive then give your hard drive a firm tap on the side to free the reader arm which is getting stuck on the platters while you are cleaning the dust you may as well clean your computer of dust using a fine air blower from an air compressor making sure there is no moisture in the air line then you might try replacing all the leads that attach to your hard drive including electrical extensions + IDE,SATA and the ones that attach from your motherboard to hard drive make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ? good luck
hope this helps
It could be power or a fan is not working open the side cover and check if all fans start spinning when powered up. If it is a power supply issue, there is no easy way to change it out. You have to take everything inside the case out. Issue like these are best left for Apple service centers (and yes they do this on purpose). Also try and remove all cards and only reinstall the video card (make sure you remove it and reinstall it). From there remove all the memory sticks and put one in and try to boot. Switch that one out with the others one by one and see if it boots. Try them in pairs also. If still no luck try and disconnect the hard drive and see if it stays on longer than previous. If so put in your recovery disk and boot from the DVD drive just to see if it boot into the recovery disk. I doubt if it would be your Hard drive giving it symptoms like this but with out having the machine I can only say to try testing every part if you are able too (before taking it to Apple). If it is a liquid cooled version 9i.e. G5 2.7 or most G5 made in 2005) than there could be issues with liquid leaking out of cooler and into the power supply. Let us know how it goes.
Disconnect the data-cable and power-cable from the extra hard-drive, and try again. If the problem is the same, then the extra hard-drive, by itself, is not the problem. Borrow a power-supply, and connect it to the motherboard, and see if the alternate power-supply solves the problem.
There should be 2 thumbscrews on the back part of the case where the side panel would slide back and off. On some other cases, there is a button on the bottom you need to press to have the side panel swing open.
this is a common problem with G4 Quicksilver. Your power-supply is defect and has to be replaced. I have 4 G4s in my lab with the same symptom: a short flash of the power-button light, sometimes it turns on, but mostly the machine is dead. Richard