If you install Centos 5.4 on Hyper-V R2 with Linux IC, it could hangs on reboots. We installed Linux Integration Components v2 and Linux Mouse Driver from Citrix. But we couldn’t solve the problem at the beginning.

Then I realized something, Hyper-V doesn’t support 4 CPU in Linux Machines. So I switched the CPUs 4 to 1:

And Wolaaaaa!

This solved all problems. Have fun!