IMac G5 will not boot and if it does, it does not display any logo

Hi everyone, any assistance with this issue would be greatly appreciated. This is my godmothers iMac G5 that my family gave her a few years ago, it is the 2.0GHz model with no iSight camera but has the built in WiFi and Bluetooth.
I went to start it today, after it being off for a week and a half and it will not boot. I start it up and it displays the solid white LED light on the front and revs its fans until I stop it. I got it to get past this once by resetting the SMU but all it did was make the Apple hardware test sound noise and get a blank white screen. No Apple logo or anything. Entire time it rev'd its fans.
Thank you! If it is broken I will most likely sell it for parts and either buy her an older unibody MacBook or wait for the next-gen iPad with FaceTime and a buy a keyboard dock.

HI and welcome to Apple Discussions...
If you have the install disc that came with this G5, try checking the startup disk for errors.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
(In Mac OS X 10.4 or later, you must select your language first from the installer menu)
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. Make sure there is always 10% to 15% free disk space
If it won't boot from an install disc, try booting in Safe Mode Launch Disk Utility (Applications/Utilities). It's possible to do a live verification in Safe Mode to check the startup disk for errors, but not repair disk but at least you might get some insight as to the problem.
Carolyn

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