For those who are still having this problem, this might help.
Problem: Media Control Buttons Disfunction on Dell Studio 1535/1536/1537
Description: Media control buttons on Dell Studio 1535/1536/1537 systems may report intermittent disfunction issues.
The typical failures may include:
1. Media control buttons automatically light on.
2. Optical disk automatically ejected.
3. Some media control buttons have no response.
Solution:
Update firmware for system hinge cover.
Create a bootable CD:
NOTE: Please make sure you have CD imaging software installed in your system, which can create a bootable CD based on ISO image format.
1. Download the firmware installation file FM7_X0D.ISO, and save it in your system.
2. Run the CD imaging software to create a bootable CD based on this FM7_X0D.ISO file.
Take Roxio Creator as an example for the procedure.
1. Insert a blank writable CD in your system.
2. Open Roxio Creator.
3. Click File menu.
4. Go to New Project / Copy / Burn Disc Image to Disc.
5. Click Browse.
6. Add this FM7_X0D.ISO file from the location you saved.
7. Click button to continue, till complete the CD creation.
Flash firmware:
NOTE: Please make sure A/C power is being used while updating the firmware.
1. Insert this CD in your system.
2. Reboot the system, and enter one-time boot menu by pressing F12.
3. Boot from the CD drive.
4. The CD will autorun and update the firmware.
5. Once completed, screen will show pass and Flash Successful.
6. Shut down the system.
7. Remove A/C power cable and battery.
8. Replug in A/C power cable and battery to continue normal operation.
NOTE: Please make sure to remove A/C power and battery once firmware update completed.
Download Link:
http://csmicfool.com/files/FW7_X0D.ISO
Credit: krypebud from Dell Community
Source:
http://en.community.dell.com/forums/p/19125998/19494905.aspx#19494905