Identify what version PS2 you have The version 1, 2 and 3 PlayStation 2 all have 10 screws on the bottom of the unit. SCPH30001 v1 = Serial# begins U1 SCPH30001 v2 = Serial# begins U0 SCPH30001 v3 = Serial# begins U1 Date 1A SCPH30001 v3 = Serial# begins U2 Date 0D The versions 4 through 10 PlayStation 2 all have 8 screws on the bottom of the unit. The 4 and 5 also have the electrical warning stamped on the bottom of the PS2 case. SCPH 30001 v4 = Serial# begins with U0 SCPH 30001 v4 = Serial# begins with U1 SCPH 30001 v4 = Serial# begins with U2 SCPH 30001 v4 = Serial# begins with U3 SCPH 30001 v4 = Serial# begins with U4 SCPH 30001 v4 = Serial# begins with U5 SCPH 35001 v4 = GT3 Edition There are 3 different motherboards for the SCPH30001R - Version 4, 5 and 6 SCPH30001R v5 or v6 Motherboard SCPH39001 v7 SCPH50001 v9 SCPH50010 v10