|Optical drives themselves don't boot - they just spin, or don't spin. |
The most common reason a disk with data on it that drive can read in an optical (CD or DVD) drive fails to be recognized properly by the bios while booting and Windows after the drive has been used a lot is it can no longer spin a disk at the minimum 1X legacy audio CD speed because it's cheap sleeve bearings on the motor have deteriorated to the point there is too much friction in them.
You're probably hearing the drive attempting to spin fast enough for the minimum speed or faster, but it can no longer do that. Typically it trys a few times, then no longer trys, until you eject the drive tray and retract it, then it will try again.
Buy yourself a replacement drive on the web.
E.g. search for: Asus N61Jq DVD drive
Note that your Boot Order or similar settings in the bios Setup must be set correctty to boot from an optical drive,
See Response 1:
or you must press a specific key while booting and select an optical drive to boot from, in order for the bios to boot the computer from a bootable disk in an optical drive.
However if a disk with data on it that drive can read is not recognized at all in Windows itself, the most likely thing is the motor bearings are producing too much friction
That guy in that topic you found
probably has desktop computer. The solution worked for him but that's probably not what your problem is.
In his case, his bios must have been able to recognize a disk in the drive properly otherwise the solution would not have worked. You don't normally get the lines in the Registry mentioned in the topic that Windows inserts when it detects a problem with the optical drive on a laptop. On a desktop computer that situation is usually directly related to there having been a poor data cable connection that caused Windows to insert those lines. Laptops don't have data cables for the drives - they have direct connections If you do have those lines in the Registry the drive is probably defective and needs to be replaced in any case.
If the bios does not recognize a bootable disk in the drive while booting when the bios has been set correctly to boot from an optical drive - you should see "Press a key to boot from CD" or similar while booting if it does - the only thing that can cause that is the drive has a problem, most likely the bearings have too much friction.
Another less likely thing that can happen is one of the lasers or it's assocated circuitry has malfunctioned after the drive has been used a lot. DVD drives have at least two lasers - all DVD drives can read CDs. If one laser or it's assocated circuitry has malfunctioned, the other one usually still works. It will either read CDs fine but not DVDs, or read DVDs fine but not CDs - it still needs to be replaced.