Does it hangs on the PS logo screen or you get a black screen (NO PS logo at all) ?
It can be easily solved by using some tool to insert a japanese boot sector in the euro/US discs. The japanese PS2 machines do check if the boot sector is valid japanese or not .... I think it won't work at all if you even swap a byte on the PS logo TMD (the 3d model of the logo, which is on the boot sector.)
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)