I've installed the new Win7 RC and started it. but then when normally the Configuring Screens with UserName, PCName etc. comes, i get a blackscreen. but in the right corner, there is written "Build 7100"... in the safe mod it works perfectly... Vista also works perfectly. and in the build 7077 it worked perfetct too. i also bought a new monitor. i installed the RC after i plugged in my new monitor.