How To View Inverted Rows From Many-to-many Table

Hi, my name's John and this is my first post here at SQL team. I've learnt a lot from the forums here, never needed to post though. I'm pretty good at sql, but not that good and I think for the first time in couple of years I now have a query that I'm completely unable to create.
Let me explain the setup.
I've got three tables e.g.

Products (productid, Name)
100 Computer
200 Printer
300 PDA

ProductActions (ID, Name)
6 changed casing
8 Changed motherboard
7 replaced cd-drive

ProductPerformedActions (productid, actionid)
100,7
100,9
200,8

This basically shows a simple setup showing that product (computer) has been done the action "repaired" and product (printer) has been done the action "changed motherboard". The query i'd like to have is where I can select all products that have not been performed on cerrtain actions. e.g. a list of products that have not been performed on all actions, such as

UnPerformedActionsList(product,actionid)
PDA,6
PDA,7
PDA,8
Printer,7
Printer,6
Computer,8

I know its foundation is something like this:

select productid from products where productid not in
(select productid from productperformedactions....

which elimiantes products that have been performed an action on, but it also removes it for ALL actions,
which i'm trying to avoid. All i want is kind of a cross join, listing all actions, then inverting it, to show
all products that have NOT had it performed on them.
I hope this makes sense.

Thanks
John