i have a dell optiplex 320 standard it has a 280w power supply it recently quit booting im fairly sure the psu went bad i installed a geforce gt520 graphics card that recommended a 300w but i had a i think a gs 8400 in it b4 an the maximum power is lower on the gt520 the 8400 worked for afew yrs then idk exactly what happened to cause it but the fan on it melted what i want to know is what a decnt on the cheaper side psu i can get idk much about computers so idk if i need a certain type or what its a dell optiplex 320 not a tower it lays down on its side everything is factory except i upgraded ram to 1 gb im strapped 4 cash or i'd build a decent pc but need a psu to run pc an graphics card as cheap as possible any information would b appreciated.