I've just done a DMS3 install on a V4 that works fine and performs 100% of it's functions. The problem is that it works normally until the system comes up to temperature. After 15 minutes if you want to reboot it just goes to black screen. Turn it off for 2 minutes and it'll boot again. I've got a 1cm 18 gauge ground wire and twisted pairs on D and E. Last night I rules out any BIOS connections which leaves me to the SCEX, power or DVD controller points.
I'm not using the regular power point but rather the one next to the controller port and using the VIAs on the back of the board for DVD controller points. Point O is not run separately or with a twisted pair.
Any thoughts as to why the system coming up to operating temperaure is creating ground bounce?