Thanks a lot KNP and Werner for your replies. I thought I would never get any replies

@KNP
I've installed the Knoppix 7 in my pendrive from a tool. I've set the booting priority so that it boots from the pendrive. No issues with that. When the loading of drivers starts, somewhere around DRM and framebuffer, the screen goes black and nothing happens after that.
I used the same pendrive in other PC(sony vaio), it works.
I suspect there is some driver issue, though not sure. I'm very new to linux

@Werner
I tried this command "knoppix testcd". No issues with the flashdrive because the same flashdrive works in the other PC