dvd skipping after ps2 mod install

[acraiger]

Just wondering has seen this problem before.
I recently installed an internal modchip in my PS2. It appeared to be working fine. I could play backup copies of PS1 and PS2 games. I only tried games that were in CDROM format since I do not own a dvd burner. They all worked.

Then I decided to play some dvd movies I had rented. Everyone one of them skipped. They all skipped just about every minute.

Does anyone have good idea as what exactly could cause this.

Please Help