Having trouble booting ps2 cdr +dvdr!

[ajrock2000]

ok my laser went, so i bought another one, and i just installed it. here is my results.....

I boot up cdr and dvdr and i get the Playstation 2 Logo, and thats it. the logo dissapears and the cd makes some more noises, then it eventually stops. i tried loading a regular dvd game, wouldnt work the first time but i adjusted the black screw on the rail, and it worked. but i have had no luck booting cdr backups. ive tried adjusting a whole lot, and nothing....

what should i do?