PSX Backups Not Working On PS2

[SharpShooter31]

here's the info and my problem...

backup game: myst, jeopardy, jeopardy 2nd edition
backup burned at: 2x
backup burned using: nero
media used: sony, tdk, maxell
ps2 region: ntsc
ps2 version: 7
ps2 modded with: apple

i also had a v5 using a neokey and these backups still wouldn't boot up. well, they boot up but the problem is that they only get to the psx logo, no further. on all three you can hear the disc spin up then stop, spin up then stop, etc etc. i burned them at 2x so how can the ps2 have trouble reading them? oh, and the strange thing is that i can play them albiet not pefectly, using epsxe(emulator) on my pc. i jus cant figure it out, any ideas? i've also tried some burned by others, but i get the same results.