Tomb Raider 3 on PS2 ( again)

[ottoman]

Okay, so I know I've asked this question before but i live in hope that someone can answer it.

I got original PSX tombraider 3. This boots fine in my ps2.

I make a backup using any copy program ( CDRWin, CloneCD, BlindWriteSuite) and it will run up on my chipped psx no worries.

The PS2 wont run it, I get to psx screen and then blank screen.

The title is obviously compatible with the ps2 cos the original runs.

The copy is obviously good as my psx will load it no probs.

So why don't the ps2 run the back-up?

It blows my 16Kb brain!!!