Audio cuts out after 10.5 upgrade

ok, I have a 1ghz G4 17" powerbook. Upgraded from 10.3.9 to 10.5 , zapped pram. Repaired all permission etc
When I now play any audio in any application through either my ipod or a file on the HD, through either USB Soundsticks or built in audio, the sound plays for about a couple of seconds and then cracks and stutters/skips and stops playing completely. After the audio stops I cannot play it again and/or track through a song or start another one. Its like the app dies with it. After a couple of seconds I can push PAUSE and then restart another song, but then the same mess happens all over again.
Sometimes the sound keeps playing (with intermittent skips and dropouts) but as soon as I move the mouse or adjust the volume keys on the keyboard, the song skips and stops altogether.
If i dont move the mouse, the song plays in itunes but pops and skips every 20 - 30 seconds. then as soon as I move the mouse to do anything the nightmare begins again.
What I am experiencing is similar to when you are playing audio and doing a huge task in another app where the memory and processor is under serious strain. It skips and stutters and then cuts in and out and finally stops altogether and cant be started again. However I have no other apps even running.
If someone has any suggestions it would be great. A mac without sound is pointless and a disaster for my work.

problem solved thankfully by repeating the upgrade installation. everything is running perfectly now

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Here are the possible HP products for a Touchsmart 9100. Both models do not list Win 7 Home Premium as an HP supported operating system. Did you upgrade from Vista to Win 7 or did you perform a clean install of Win 7 Home Premium?
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Jaco
****I am not an HP employee****
Please give a" Kudos" if advice received is relevant or" Accept as Solution" if your problem has been solved.
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16 GB DDR3
Pegatron Motherboard- IPIWB-PB (Pittsburgh), Radeon HD 7570 1GB. Win 7 Home Premium upgraded to Windows 8.1 Pro.
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Pittsburgh2 Mainboard, NVIDIA GTX 645- 2GB GDDR5. Win 8.1 Pro.
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16 GB DDR3.
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Win 7 Home Premium upgraded to Win 7 Pro.
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