is this a version 4 ps2 30003?

Could be a V4 or V5 best way to tell is turn it upside down with the expansion bay cover off and if you can see the screw marked with the blue arrow in the pic its a V5 if theres no screw its a V4

http://www.imagestation.com/picture/sraid90/pa66e8dfc13bcb3a8c2184211e6c4bf78/fa734472.jpg

dont think its ver5.all v5 iv'e done are 30003r.

Could even be a V3 machine as its the same number for V3/V4. Check how many square screw covers are on the base of the PS2, include the rubber feet. 10 is a V3, 8 is a V4..

Also, a V4 machine has the electrical warning stamped into the base, V3's don't.

Mike ( Spagboll ) ... :)