The Asus K55A-RBR6 optical drive uses the Windows built-in driver. The drive may have failed or it could have a power or cable issue. To check for a power issue, try ejecting the optical drive by pushing the disc tray into the computer. If the drive tray ejects and retracts, it has power.
First, go to the Device Manager and check if there are any driver issues identified by Windows. (Click Start > Control Panel (in the right hand column. Click on either System and Security > System or Hardware and Devices and then select the Device Manager. Expand the section for DVD/CD-ROM drives and look for a yellow triangle with an exclamation point or a red triangle with an x. Try to uninstall the driver and then reboot the machine. Windows will try to restore the driver. (You should alsocheck Windows Update for any optional drivers. Start > Control Panel > System > Windows Update.)
Check that you have installed the latest available BIOS upgrade (407), from
http://www.asus.com/Notebooks_Ultrabooks/K55A/#support .
The laptop uses a SATA slimline internal optical drive. The drive needs a power connector from the internal power supply and a SATA cable connected to the motherboard. You can access these if you disassemble the laptop. You may want to try just replacing the drive (~$25 at many vendors). If the second drive doesn't work, then try replacing the SATA cable and make sure it's well seated at the motherboard and the optical drive. There aren't extra power cables in most laptops but you should check for damage. Alternatively, get an external USB optical drive to replace the internal drive.
I hope this helps.
Cindy Wells
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