Audio problems - sound delay on play - and cutting out.

I have an iMac 27" i5 - and having an audio problem in FCP 7.
There is a delay when I press start/play. At first there's no sound and after about two seconds I can hear the sound. Also when I play my sequence my sound comes and goes (cutting out) - not always at the same spot. Scrubbing is also giving me hassles - I first have to press previous- and next frame a bit (to move the play head up and down the time line) in order to hear the scrubbing frame by frame. This happens when I use internal or external speakers.
What can this be - maybe a driver update? But I'm up to date with my upgrades.
Any help would be appreciated.
Tx!

LOL - no worries
I don't have anything else connected to the iMac. Sometimes I have Safari or Firefox open - but I have also tested it without those programs open - no luck. I have not deleted my preferences - what's a safe way of doing that. My sequence setting matches clip settings.
Will keep a close eye on it when I start a new project - with fewer media on the timeline initially.
Thank you for your replies.
DrLecter79

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