Computer only sometimes boots and sometimes the fans get loud, the plastic air deflector Is fine and has the reflective piece on tab! the usb ports seem to be dead I pushed the motherboard button located under the ram!
Only attempt if you feel able.
before going to the extreme of fault finding, just try this.
place face down on soft material, remove all screws placed for safety, latex gloves and with a hand held Hoover and fine soft clean dry paint brush get the insides and fans a good spring clean.
reasemble, hopefully dust removal do the trick, mine did, so possibly yours.
SOURCE: Mac G5 shutdown and now won't power up
Sounds like a bad power supply. They do go bad... get a new one and hook it up without installing it. If it boots your machine...you've solved your problem. That battery retains some boot info and your date/time settings.
SOURCE: Power PC G5 Dual 2.5 sudden shutdown and no reboot
In G5 always the cover should be closed properly if not it will start the fan very fast like a blower and the red leds will be on showing that the heat is over so please check that the cover is closed and locked from behind so itworks smooth and the power supply is standard or normal
u should always use genune parts with mac..
thanks
SOURCE: G5 Mac Desktop freezes at random
First you need to run some maintenance (which in itself may solve it) to rule out software issues, so start here...
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Mac OS X: How to start up in single-user or verbose mode
If that doesn't help, try booting into Safe Mode and see what happens, if it comes up hopefully another restart may solve, if not, you can at least use this as a starting point to try and resolve. Safe Mode will allow you to get around, surf, etc...
What is Safe Boot, Safe Mode?
Mac OS X: Starting up in Safe Mode
If Safe Mode comes up alright, I would install AppleJack, excellent troubleshooting article can be found here... Troubleshooting Tools: AppleJack
Another excellent free tool for performing maintenance is Onyx (be sure to download the right version for your system). Install the package, then run it, it will check your drive and the structure, after this, click on the automation tab and check on everything for Maintenance, Clear Cache, Cleaning, and check on Reset -> LaunchServices database and Mail's Envelope Index. When it completes, restart. Repeat any time something seems flaky, if not try to run at least once a month.
SOURCE: G5 failing to startup
Sounds like the power supply is over heated or over powered. Check the fan is spinning at the back of the power supply or buy a new power supply which are very cheap these days.
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