I have a Dell Inspiron 530s. Due to my dog peeing on it, it needs a new power supply. It has a 120w 24 pin power supply. I'm a bit short on money at the moment, so cheap as possible is best, and I'm just not that familiar with buying online. Any suggestions would be greatly appreciated. Oh, the current power supply has the model number dps-250ab-28-b and is made by Delta. And again, thanks.