Help me !
 

My first install cannot detect my cd room.So how to proceed?...I use Acer aspire 4520..

Welcome to LQ!

I had no such problem with that laptop.

Distro?

Use the boot time option all_generic_ide

(add that to the line kernel.... )

Adding some more information in your Title would help us! Such as "My first install cannot detect my cd room.So how to proceed?".

Providing more information on your system would also be helpful. Such as the distribution of Linux that you are using, the hardware on your system, and the type of cdrom. You can get some of this information from command line utilities and some from files. Ask if you need help.

Try to see if your cdrom is listed in dmesg.