My last startup posted an error and the UNRAID just hang.

The error reads something like "kernel bug....." (I did not take down the entire message, hoping after a shutdown and restart will be ok)

After i tried a shutdown and start, the screen just hanged at the screen after bios, HDD detections and keyboard..

Now i am seeing nothing and several restarts still the same.

Is my cpu/motherboard faulty ?

What action should i do next ?

Get your usb drive out and check it in windows, it might be faulty..

Or if you have a suitable drive you could boot into a live Linux distribution such as Knoppix and use its file manager to copy files / folders. You would not need to add any extra drivers to allow your unRAID data to be read.