Early Imac 20" freezes on regular mode but works fine in safe mode, any ideas?

Have a early 2006 Imac 20" that won't run in normal mode; freezes within minutes.  Run fine in safe mode, but safe mode won't play sound or allow exterior inputs.  In high fan state, don't know the name of the mode, but you hold the power button while plugging in power cord, the machine also runs relatively fine.  The machines been glitzy for years, developed the lines/colour patterns that's been mentioned in other forms/threads, but it still ran programs.  Took it to apple and they said the board is the issue and my machine is obsolete.  Fine, I just want to understand why it will run perfectly in safe mode; no lines, no freezing, all programs running...but won't last minutes in regular mode.  Also, if anyone has a way to play music...in bluetooth or appletv in safe mode, let me know.
Thanks.

Most of thee skinny on that...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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