Why is it making noise every time i turn on power

If its making a spinning noise then , under the scanner glass you will see a light assembly.on each side of the light assembly you will see two pairs of gears.if that gears are cracked /broken or getting blocked due to any dust object .then this can be the reason of the loud spinning noise.you will need to open the upper cover of scanner and even the glass layer of scanner.the glass is stuck on the rectangle sides of the scanner not very hard but its bit delicate job to do .so do it carefully if doing it manually/. but if the noise coming is not spinning but its humming noise then its not the gears problem its the problem of the motor in the scanner.there is a motor in the scanner assembly.the motor is located under the green color mini circuit board of the scanner.for checking motor ,you will need to remove the upper and glass sheet of the scanner.in both the problems you need to remove the upper cover and glass sheet. beside the motor there is a electrical cable .also check the cable which is connected to the motor if any of the wire of that cable is getting cut or the cable itself is getting loose then it can make the motor overheated and this can make the loud humming noise. this will help.do it carefully and slowly.please do rate the solution if helped.keep up dated for further assistance if required. thanks.

If the noise is a high pitched whirrrrr, it is the scanner warming up and getting ready for the scan job. If it clunks, or the noise "sounds bad", make sure the "Lock" is not engaged on the bottom of the scanner.