Why is my fun sound very high now .

@asaphsentongo sounds like a bad or dirty fan. I would replace it since it is an inexpensive but vital part for your computer. To work on it use the HP 350 G1 Maintenance And Service Guide Page 90 will show you how to work on your fan. You also want to consider replacing your thermal paste. That way you know that maintain proper cooling for your processor. Make sure that you also clean all the air inlet slots on your computer etc. Dust and grime can cause overheating. Heat is the biggest enemy of your computer. Here is great generic guide for the thermal paste replacement How to Apply Thermal Paste