It's a V1 or a V2. If you press the triangle button on the browser screen (after you do the setup thinggy) it will show "Unit UNKNOWN" instead of
It means that the EEPROM got erased or at least it corrupted or damaged somehow. It has the data for the tray door speed so it will open in a bam without that data. And the PS2 won't read any discs.
One thing you can try is open it up and try to deattach the daughterboard (the eeprom is on it) and reattach again. If it solves the problem, it was unnable to read the eeprom due to the daighter board connector being dirty.
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...)