Psu switch

So recently my computer started making a weird noise when starting, sometimes it took a while for it to begin sounding. Then I started noticing my computer rebooting spontaneously, I figured out it was the psu fan, and also felt it becoming warm very quick. I have pre-built Acer Nitro N50-600 and it uses a liteon power supply ps-7501-5, is there any other good power supply that is suitable for my pc since this one is very expensive and hard to get?