[Solved] Loud Noise at Startup

Hello,
I've searched in multiple locations but cant find a solution to my problem. Over the last couple of months my computer has been making a loud grinding noise at cold boot. The noise used to persist until I arrived at the Windows desktop and then would completely go away until I shutdown and rebooted several hours later. Lately though the noise has continued even once i reached the Windows desktop and I've had to shutdown and reboot. Once I did the noise would be completely gone.
Ive opened my case and dusted all the fans, once I did this i noticed the problem continued, so I preceded to check the fans by lightly tapping them while the computer was making the noise and seeing if the noise stopped or sounded different as a result of my tapping, to my surprise none of the fans were failing. I then checked the PSU to see if the noise was coming from it but it seemed silent. I traced the noise to the right side of the motherboard its almost a loud buzzing whirling noise and i cant seem to figure out what it is. The computer seems to be running fine ive played a few games on it or hours with no diminished performance or notable problems. Any suggestions on what to do next would help. I dont want to turn it on one day and have it break on me.

I know it sounds stupid, but do you have a disk in the optical drive?

I did not have a disk in the optical drive when i booted so I didnt think that was the cause of the problem. I did although open the drive and the sound stopped. It seems the tray was making the noise somehow. Its weird that the problem didn't effect the disk i inserted when i tried to install software and the noise did not appear when there was a disk in the drive, only during bootup. Im going to call the drives manufacturer and see if i cant get it replaced before it starts messing up my disk. Thankyou for your quick replies and help.

Best answer selected by theenigma87.