Apple mac G5 freezes when booting up. - Apple PowerMac G5 Dual Mac Desktop

Try running Apple Hardware Test on the machine (it's one of the discs that came with the machine.) Also, if it's freezing by showing the spinning rainbow cursor (beachballing) you may have a failing hard drive. That wouldn't be uncommon for how old the machine is.

Those are some memory sucking apps... how much RAM do you have installed? What OS?

powermac G5's are notorious for having bad power supplies. you might need to find a way to replace the power supply

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Trying booting from the Mac OS X install disc.

insert the Mac OS X install disc.

press the start button while holding down the "C" key on the keyboard

If it boots normally from the disc. you have a bad hard drive and it will need to be replaced.

Hi,

I am Sorry to Hear this Problem. This is a Common issue on G5 Mac Desktops. You could Google ' G5 Freezes ' and you would see many People facing the same Problem.

This is more often a Bad Faulty Logic Board. There we Certain Recalls for the same. You need to Contact Apple to check whether your Machine would be Covered under Warranty or not.

If you have the Installation Disc, You could try to Reinstall OS first. If you can't boot a CD, it would more likely Confirm Faulty Logic Board.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Do you have your G5 hooked up to a UPS? The symptoms are consistent with drive-spin-up current load temporarily overloading a marginal/failing UPS.

you will need an intel mac to use a xp boot disc.

or with virtual pc installed you can run windows 2000, not sure about xp though.

Probably the OS 10.5 version your're installing is not compatible or supported by the system motherboard of your computer model Apple Power Mac G5. per my research from Apple website herewith is their solution quote on what applicable OS to install for such model: "Power Mac G5 (Late 2005) and iMac G5 (iSight) models require Mac OS X 10.4.2 or later, you can t install Final Cut Pro 3.x or earlier versions on these computers. Final Cut Pro 3.x and earlier versions are not supported on any computer running Mac OS X 10.4". best regards

Since you are able to see your mouse pointer move, the display is refreshing so the problem is with something other than the graphics card. Generally software / OS related.

So assuming you aren't experiencing a hardware failure try the following...

Boot from the CD the computer shipped with.

Insert CD and restart the computer holding the "c" key
Your computer should boot from the CD

If so run disk utility from the CD and repair the disk as well as permissions. If there are any errors repair again.

If this is successful your computer "should" be repaired. If it is still freezing, use your CD to perform a Archive and install which should keep all your personal settings and installed software intact.

Cheers

uninstall the antivirus and unused softwares and then try