hi, recently i have found my dvds dont always play in my vaio vgn tt1 laptop, im running w7 ultimate 64 bit, all discs are in good condition and play on other machines, on inserting disc the drive will spin up and try to start disc but then stops , then it repeats three times trying to start but again stops. any ideas, is it time to replace it? machine is about 4yrs old. many thanks carl.
