Disc is either to scratched or may have a hairline crack on disc. If this happens to all of your disc's, then you have a laser read problem. This can be caused by high humidity as well as dust and debri. Try blowing the unit out with canned air.
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hi welcome to fixya
here is my solution for that problem, first lets verify to narrow down where the main cause it could be. lets use first a dvd cleaner, dust can cause the optic lens not to read. then insert a dvd observe the light indicator ( yellow ) if blinking which mean the optic lens is starting to read the disc, if not it doesn't read. so at this time you are going to remove the cover with your dvd drive just to know and access the mechanism as will as the optic lens. now turn the power on and insert the dvd look for the optic lens if emits red light then moved going up to read the disc which mean the optic lens has supply. then check the spindle motor if rotates normally if not check the motor replace if defective. one way on how will you check the motor if defective through using a analog tester, check the resistance on the positive and negative terminal of the motor if the resistance is almost 0 ohm or shorted which mean it was worn out need to replace. hope this will help thanks for consulting through fixya.
Does it not acknowledge dvd disc only or cd or dvd both. If it doesn't read the dvd disc, or able to play dvd disc, but able to exlpore regular cd's, then you have a codec error, and you need to download a dvd codec like powerdvd for it for your system to play dvd disc. Check to see if your dvd-rom drive appears in the "my computer" window, if it is there, but wouldn't be able to play anything, then it could be a driver issue. so make sure in the hardware , the drivers is installed and working properly. If it is working properly and driver is installed, then you got a bad drive, the optical laser lenses isnt reading or the spindle ain't working anymore if you don't hear disc being loaded when inserting the disc.
you said you have p/n 280751-B21 , this is 16X DVDROM Read only -- this cannot do anything buit read DVDs.. it will not record anything, it is not capable.. if you give me the computer modsl and S/N , i iwll advise which CDRW/DVD youc an install in it (computer) to record and write CDs and DVDs
1.if the dvd has some scrathes on it cant read as a result it cannot read 2. if the dvd is not written properly while writing using some dvd burning software it will not read that dvd properly . 3.if the dvd is pirated some dvd roms support only original dvds that might be a problem 4.if some dust accumulated on the lens of dvd rom the dvd will not get read properly for this u can use some lens cleaners and clean the lens of dvd rom it is available in the market everywhere try this it will definately work 4.after doin the above if still none of the dvd \s arent working means the life of your dvd roms lens is over now u have to get a new dvd rom
You can try to uninstall the hardware, turn off the PC, and then allow Windows to find it when it reboots.
Or you can try to update the drivers for it by going to the manufacturer's website. (google is your friend :D)
You can also try the restore function located at: start -> all programs -> accessories -> system tools -> system restore
restore it to a earlier time when it was working with no problems.