I installed a M2 v1.22a into a V4 console for a friend but the darn thing doesn't seem to work. It doesn't read DVD-R's and always comes up with RSOD. I've installed a M2 in 3 V5's and 3 V7's with success (and I absolutely love it, thanks Charlie_PS2 for the hookup) so I don't think I did that bad of a job installing, granted that they are easier than the v4 (especially the cd/dvd controller. I've went over the installation with a continuity tester and an 8x Magnifying lens and everything seems fine. I've even bought a DVD lens cleaner to see if that did the trick but to no avail. One thing I noticed though, is that the functionality of this unit is different from one of my successfully installed ones. Instead of having to hold the "RESET" button until the "EJECT" light comes on, the unit just plays a PS1 disk instantly as if it were a regular PS2. The DVD movie is the same, you don't have to hold the "RESET" button for 5 sec. to turn off the M2 to play a movie. With this said I kind of ruled out the laser being worn out or needing recalibrating and I think the M2 is not working or auto-detecting the correct system. I was wondering if anyone out there can help me? Any help is most greatfully appreciated. Thanks in advance!