My PS2 wont boot dvd-r's

[there is light]

I have a PAL PS2 30003 version 4, with neo 2.2.
It works every time with cdr backups, even cheap unbranded, so I dont think it is the laser. But it wont boot dvd-r's, I use GTA 3 as an original high TOC, use Memorex dvd-r, burn't discs o.k. with nero and Prassi, use a Pioneer 105, windows XP, and have used Region X and AR2 v2.
When I try to load the backup after the tray on the PS2 ejects the tray wont go back in on its own so I have to use the eject button to return it.
I have followed all the guides on booting that are out there, turn off 5 seconds, hold the power button, eject the AR2, put in high TOC orig etc etc. But the tray won't go in on its own.
Do I need a new chip or a new vesion PS2.
Some one must now what I am doing wrong.
Is it me or is it Memorex.