Windows server kept restarting giving blue screen

One of the Windows 2003 server was having issue that it was giving blue screen and restarting after windows logo during boot.I had to get Windows 2003 CD, then i changed the server's BIOS to boot from DVD/CD drive. Upon restart it asked me if I wanted to reformat or repair the disk. So i typed in "R" and it took me to recovery console and then in there i typed "CHKDSK" after few minutes it came with results and then after this I typed in "FIXBOOT" and pressed enter. This command makes a new startup sector on the system partition. After that I typed in exit which restarted the server and I found that the server booted normally.