Can you return a Dell Outlet PC even though used ?

I have opened and used a DELL PC and having problems with booting as mentioned on previous thread. Before I ring DELL Support today, I want to know am I within my rights to return the PC to DELL Outlet as it is not in its original condition or do they have to be giving the opportunity to fix.

This is from the Dell Website:
Acceptance
When you receive Product you must inspect it for any defects or non-conformity within 7 days. After this period, you will have accepted Product. If Dell agrees to the return of Product at its choosing, it must be in its original condition with packaging, a return note and proof of purchase; the return costs may be payable by you.