Q. We have 4 different versions of Linux kernel installed by yum command under CentOS Linux. Currently I'm using only latest version 2.6.18-53.1.4.el5. What is the proper and suggested method to remove old kernels from a CemtOS / Debian Linux server?

A.Most Linux distro keeps old kernel files so that you can revert back in case of emergency pop up due to hardware / software incompatibility issues. Kernel is nothing but other files on Linux box. Following is the suggested way to remove old kernels.

Step # 1: Find current kernel version

uname -r
Output:

2.6.18-53.1.4.el5

Step #2: List all installed kernels

Use rpm or dpkg command:
# rpm -q kernel
Output:

kernel-2.6.12-1.el5
kernel-2.6.18-17.el5
kernel-2.6.18-53.el5
kernel-2.6.18-53.1.4.el5

Debian / Ubuntu Linux user, enter:
$ dpkg --list 'linux-image*'
Output:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                          Version                       Description
+++-=============================-=============================-==========================================================================
ii  linux-image                   2.6.22.14.21                  Generic Linux kernel image.
un  linux-image-2.6                                       (no description available)
rc  linux-image-2.6.20-15-generic 2.6.20-15.27                  Linux kernel image for version 2.6.20 on x86/x86_64
ii  linux-image-2.6.20-16-generic 2.6.20-16.32                  Linux kernel image for version 2.6.20 on x86/x86_64
ii  linux-image-2.6.22-14-generic 2.6.22-14.47                  Linux kernel image for version 2.6.22 on x86/x86_64
ii  linux-image-generic           2.6.22.14.21                  Generic Linux kernel image

Step #3: Remove all old kernels

WARNING! These examples may result into unstable system if not executed with care. Do not remove the kernel the system is currently running.

Choose which kernel you want to uninstall from the list of those installed. Type the following command to remove the kernel package under RHEL / CentOS / Fedora Linux:
# rpm -e kernel-2.6.12-1.el5
Type the following command to remove the kernel package under Debian / Ubuntu Linux:
$ sudo apt-get remove linux-image-2.6.22-14-generic

출처 : http://www.cyberciti.biz/faq/blank-screen-during-a-linux-graphical-installation/

Q. I am using Dell Laptop to install a Linux. However during installing I am getting a blank screen? How do I fix this problem? I need Cent OS Linux for testing web and php application on this Laptop.

A. Chances are very high that your latest laptop screen may not be detected by Linux distribution. However you can force to use VGA screen option. This may work out:

At the boot prompt type the command:
boot: linux vga=2

Or better pass ask parameter
boot: linux vga=ask

It will help if you have problems related to vga card to change the startup video mode.

Another recommended option is install linux in text mode and later configure screen and display card. Type the following boot parameter:
boot: linux text

Please note that vga is actually a boot loader parameter; the value is passed to the kernel using a special protocol.