Problems booting CD/R on modded PS2 with magic 3.1

[SpikeL]

Yeah i've tried the sims, BMX XXX, and one other game that is on CD/r from memorex and they don't work. I dont' have a DVD burner so I haven't tried PS2 DVD/R backups. Also another note. I have a 3.6 chip but i heard it was a 3.1 just with a clip and since the clip gave my problems i just soldered the chip right onto the board without the clip.