My bike keeps jumping in the smaller cogs on the rear cassette when under medium pressure. It has a new rear cassette and chain...How do I know if the derailer is rooted???
Derailluers usually last a really long time, about the only thing that wears out on them are jockey wheels. The most common reason to replace a derailleur is because of a crash and it gets bent. Once they're bent they are almost impossible to straighten out.
Now after you installed that new cassette, did you re-adjust your derailleur stops and cable tension? You should always double check the derailleur adjustment after putting on a new cassette, because the cogs may line up slightly differently between different cassettes.
Also verify that it is indeed coming from the rear. I had a similar problem once, and it turned out to be the middle front chainring was slipping, because I replaced the chain. Put the bike in the granny or big ring (which are used a lot less, and won't be worn out) and see if you still have the problem. If the problem goes away, get a new middle ring.
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