No it's not normal but we don't have much to go on. I assume it's a PAL PS2
a) Which mod chip? and what sort of installer did the job?
b) What are the symptoms of PS1 games not booting & are they PAL?

Mod unknown... i assume neo1? Installer was dischouse in Leeds... and yes a UK model.
2 ps1 games... Bloody roar 2, i think is US and works - with ea method.
other game is tony hawks 2 - still cant get it to work no matter what, just goes black and does nothing else.

all ps2 games work so far - ripped from my own collection. But again EA method.
Oh and AR 2 v1.3 or 1.7

This is starting to drive me nuts.
The shop aint worth shit and want £150 for NEO 4 installed, not a chnce if they cant help me with this.