My laptop's fan makes a horrible noise

[pekonilordi]

I cleaned my laptop's fans carefully with short bursts of compressed air and after restarting my laptop the left fan started to make a horrible sound. I have school tomorrow but I can't bring my laptop if it sounds like this please help ASAP..

 

[webworkings]

It could have something stuck in it from your access. It happens. A piece of debris gets lodged somewhere and it causes issues. I would check it again. Should that not help, then the fan may be in need of replacing.