I have purchased 2 types of ram for my g4 733 tower and neither works. the first was OEM and the second mitsubishi i belive. when i install them i just get a beep from the computer and it won't boot. This is low end ram that i purchased at fry's but I don't see why it won't register to the system. these are 512mb sdram 168pin dimm 64x64 pc133's. I have never had any issues installing ram before. do i need to buy better ram? I really need this working asap for a project. Thanks ahead of time to any help i get.