Hello, I just bought a new MBP (multitouch) which came with 10.5.2. It appears that 10.5.x has severe problems with external projectors (see several posts by several people here and elsewhere) and I need the machine for conference presentation. I already had the nice experience of hooking the machine in front of the audience without success (this is my 3rd Apple (Lemon?)) . I want to see if with Tiger on it I have better luck so I made a second partition with the intention of installing the old cat. Unfortunately the install disk for my imac (10.4.8) won't even boot (the laptop reboots while booting from the DVD, the media is checked and fine) and if I boot from a complete installation of 10.4.11 for my imac C2D, I get a kernel panic, at which point I suspect that simply Tiger is incompatible with the new penryns/GPUs Any suggestions to get around? Anyone has similar experience (with either projector problems or downgrading problems).