I recently open my tower and changed my CMOS battery because of BIOS faliure. All went well the problem is fixed. I also cleaned a lot of dust from inside the tower using a soft paint brush. Now the tower is emmiting a strange LOUD ratcheting noise. Any thoughts?1 person needs an answerI do too

Sounds like something is hitting a fan. With the computer unplugged, open the case again and make sure you didn't leave anything dangling.MS-MVP - Elephant Boy Computers - Don't Panic!