If you have HP Pavilion p6635be then your case isn't micro ATX but mid-size ATX.
Your new PSU will fit in it. But if you want to be absolutely sure, open up your case and measure the dimensions of the current PSU.
If you have HP Pavilion p6635be then your case isn't micro ATX but mid-size ATX.
Your new PSU will fit in it. But if you want to be absolutely sure, open up your case and measure the dimensions of the current PSU.