ive been playing ps2 backups, but recently i downloaded a couple psx games. But i couldnt get it to boot up. Sometimes it boots up, most times it wouldnt. How do i get it to boot up perfectly? i have a neo2.2 and gs2.

You need to boot with a PSX cheat CD
It comes with GS2, as for method... you can find that all over the internet

Just put them in and press reset, your Neo 2.2 will directly boot them as originals.

well, the neo 2.2 should boot them as original but maybe there's something wrong w/ ur modchip or backups.

i found a way to boot it easier. i put in an original ps2 game, wait for it to load, then eject the game and put in the psx backup. Then i press reset. But this way is too much of a hassle. Can i use a psx cheat cd to boot up psx backups?

Also,

Try Reading/Posting/Searching at the MOD CHIP forum on the board, it's THE FIRST message on the board. Read first, Search Second (Search for one word & more than three letters), then post third:
Mod Chips & Installation, Issues, Installers Etc. :
http://www.cdrom-guide.com/forums/forumdisplay.php?s=&forumid=40