aggiorna il firmware v1.68 o v1.75 ... leggasi dal sito
http://www.infinitymod.com/
The V1.62 firmware is having a small problem on some V12 motherboard.
It will stop booting PS2 discs unless the quick boot option is used.
To solve this issue simply upgrade to Firmware V1.68 available http://www.infinitymod.com/matrix/files/downloads/InfinityFW168.zip
To update, insert FW 1.68 upgrade disc and reset ps2 while holding SELECT until the upgrade screen is shown.