Loud Computer

[Undertale543]

My HP Pavilion is making a loud noise and I think it might be the cooling fan but I cleaned the cooling fan and it still makes the noise. 

[SDH]

You don't say what Pavilion or what cooling fan you're worried about.

Assuming it is a case cooling fan, say the rear one, a worthwhile piece of information is that such fans virtually always have a label on only one side of the fan, and the label is the side the fan blows air towards. So, a rear case cooling fan will have its label pointed to the rear of the case. That label will have ID information such as a HP part number or the OEM part number from Foxconn/Delta/AVC/ and on. HP chooses those fans carefully, and the motherboard's cooling strategy is matched to particular fans.

These virtually all are PWM controlled fans. HP often uses a non-standard plug at the end of the 4 wires but you have a fan there to try to match. Go to eBay and search for HP case fan, and filter for price plus shipping lowest first. I've bought many fans this way for our HP workstation projects, and if you can buy a new one that is best.  Case fans often are 92 x 92 x 25 mm in size. The standard white PWM fan plug end has 2 side ridges and one eccentric central ridge for a standard shaped PWM header. Instead, HP often uses a brownish red plug end with only two (each side) orientation ridges. Both types are shown below. It is better to get a fan with a too-long set of leads than too-short.

 You can temporarily block the fan from rotating with a narrow wood stick inserted between its blades when the computer is off. Then startup and you should discover if that fan is the issue.

Standard type PWM plug end...

Common HP type plug end...