Freezing and then blue screen every now and then

I have just bought a iMac G5 with iSight and every now and then the machine will freeze for 2-10 seconds, then go to a blue screen. Audio is only affected when it freezes and all background tasks seem to run without issue. The blue screen can stay up for about anywhere between 3 to 40 seconds.
Anyone seen this or have any idea?

HI and Welcome to Apple Discussions...
Good time to check the startup disk for errors.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
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% free disk space.*
If you cannot boot from your install disk, try booting in Safe Mode
What is Safe Mode
Carolyn
PS My iBookG4 has been a workhorse. I'll cry the day it decides to retire.....

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