I have a ACER Laptop 4520 series,model no.Z03. Prob. is with my DVD ROM.Somtime it is detected and sometie not!!!Am not able to use the CD ROM at all.Please Help me. If it is related to my BIOS,please send me the download link.

Acer Aspire 4732z optical drive? (DVD-ROM)

This is one place I found from a quick search,

http://www.aceroutlet.ca/products/Acer-DVD%252dRW%7B47%7DCD%252dRW-drive-for-Aspire-4520%2C-4720%2C-5315%2C-5520%2C-5920%2C-7520%2C-7720%2C-9300-Series-Part%3A-AD%252d7560A%2C-KU.0080E.005.html

Your DVD Rom drive is faulty, you will need to go to a computer shop or an online auction site to buy one thats compatible with your laptop after you get this through the post on the back of your laptop will be a single screw with a picture next to it that looks like 3 Cd's by taking this screw out your DVD Rom drive will come out giving you access and to replace it.

For the sound card issue, try resetting the default BIOS settings, the re-installing the sound card driver from Acer's website
for the DVD issue try re-seating the drive then run this tool
http://www.fixya.com/support/r6169039-cd_dvd_drive_disappears_in_windows

Try this for your dvd
Start the Run Command Prompt

Type in "regedit" without the parrenthesis then click ok

Go to HKEY_LOCAL_MACHINE

Then SYSTEM

Then CURRENT CONTROL SET

Then CONTROL

Then CLASS

Then find {4D36E965-E325-11CE-BFC1-08002BE10318}

The whole thing looks like this:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

Then delete the upper and lower filters....

RESTART YOUR COMPUTER

-it is possible that you the optical drive is loose. That can be resolved by re-seating the drive itself.
-first, shut the laptop down, unplug the AC adapter if it is plugged-in then remove thte battery pack of the laptop.
-you need some small philips head screw driver to unscrew just one screw that holds the optical drive located at the bottom of the laptop. You may need to consult the user's manual of the laptop.

This is a common problem with Aspire 4520 AMD Laptop. The problem is relating to NVIDIA Chipset. For solution contact 9811049801

I do have the same problem, my laptop doesnt detects the DVD writer, checked with the acer support, asked me to check the motherboard and may need to change that.

Try updating your drivers...www.download.com

Try to use another DVD. you told you tried you old DVD from your toshiba. maybe is not compatible.. try in another.. then use your DVD in another laptop if the same from problem.check your board and DVD connection...if this under warranty bring to warranty..

if in Bios also can not detect this is hardware problem...

You will need to install chipset driver but it will be much better if you reinstall all driver for it.

Acer Aspire 4520 driver for windows xp can be downloaded here :

http://www.drivercabinet.com/driver-acer-aspire-4520-windows-xp/