Non operational USB ports and stuck on grey apple start up screen

Two problems
1. USB ports are non operational. I believe I fried them by accident. When hooking up an external USB hub, I may have connected an incorrect power supply. Now the USB ports on the front and back of my tower are non operational/do not work. As a work around, I bought a USB pci card and installed it. This has been working for my keyboard, mouse and external hard drives but my iPhone will not sync. My ilok is recognized in system profiler but I cannot download anything to it.
Anyone know how to fix this? Is it possible I fried my main USB port?
2. I was reading different threads and a possible solution to the USB port problem was to reset my PMU. I have no clue why or if this would fix it but I gave it a try. Disconnected power supply and everything else after shutting down the computer. Found the pmu button on logic (or is it the motherboard or is it the same thing?). Pressed it, waited 20 seconds, put computer back together, connected power supply mouse and keyboard and tried to power up. The computer would not power up and the front power light was on but would not power up/boot. In a dumb panic, I opened up the tower and pressed the pmu button again without disconnecting the power. This seemed to work bcause my computer powered up! A red light on the logic board turned on and I got to the grey apple screen. This is where it froze. Hard reset, powered up, same problem. Unplugged power supply and tried again. Same problem. Tried pmu reset (unpluged power this time) and a repeat of the first pmu attempt. I tried starting up with cmd opt o p (I forget the exact letters but it was a reset with starting chimes), then I tried reinstalling with boot DVDs. It would get through the first DVD then restart and get stuck. Finally, I got it to accept second Boot DVD and finish installing and tried starting in safe mode. Got to safe mode and went to disk utility and checked first aid. No reported repairs necessary. Copied all files needed from HD and shut down. The computer did not shut down properly (this has been an ongoing problem before all these current problems and it has had problems booting fulling with hard resets needed once and a while). From here I tried restarting, pulling power supply, staring again and it keeps gettin stuck on grey apple loafing screen. The spinning wheel spins and then gets stuck, fans increase in speed and nothing. I can get back to safe mode either.
I'm very wordy I guess but more info the better, right?
The tower is very very very dusty. I will compress air it to clean it and attempt to clean connectors with alcohol. I will let it sit over night disconnected an then try powering it up.
What could the possible problems be? What can i do? Any suggestions on proper cleaning. I know how to ground properly and not to use a vacuum. I might have pressed the pmu button more than once. I'd the battery dead? Could it be a power supply problem. ****, I'm out of ideas and I really tried solving without posting but I'm poor and need my computer! Help!

Welcome to the forums. Lots of good information and help to be had here.
OK, first, let us know more specifically which of five flavors of Power Mac G5 you have. Find the serial number on the build plate on the inner bottom panel just below the CPUs and use this site to get the exact configuration:
http://www.chipmunk.nl/klantenservice/applemodel.html
In the meantime, assuming that you haven't replaced the PRAM battery in quite a while or ever, that would be a good thing to do.
Getting dust out of the system is a must. The power supply is especially prone to dust buildup. You might want to deal with that by taking the machine outside, as it can get pretty thick coming out.

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TS2570 My 2010 MacBook pro gets stuck at the apple start up screen

I think I've tried almost everything possible and my computer gets stuck at the apple start up screen with the loading bar under every time I shut the computer down and restart it. I've tried all the resetting, trying to do the apple hardware test (which never worked), and so many other things that I can't even remember everything that I've tried. Could someone out there possibly help me?

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Thanks again. I'll mark you 'helpful' for trying to help (sorry, but I keep getting an error trying to mark helpful, I'll have to do it later).
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Non operational USB ports and stuck on grey apple start up screen

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