Bad 9800NP?

One day i upgraded my memory.
I took vid card out and put back in.
After, It does not boot correctly using basic ati drivers.
Returned to original setup. Same problem.
Installed it on another machine. Same thing.
It looks all artifact-like.

Also, does the warranty void if I put some AS5 on gpu?

Technically yes it is voided since you altered the card. Sadly most likely you killed it via static unless you were properly grounded