I've tried to install 4 different DMS 4 Pro chips into four different v13's (luckily all of my own) and all of ended in the video signal init'ing, but then a blacksreen. After removing the chips the consoles still did not boot. Also the DVD assembly would power on, move to read a disc, but then failed to turn the laser on.
Of course I've ...
check for shorts using a multi-meter
scanned the boards at 4800dpi and looked for stray solder
wore a static wrist band the entire time
checked the chips on another machine (v9) and they all worked fine
Any ideas for future installs as the four v13 are now history?