|While randomly replacing parts is not the best way to troubleshoot computers, I'm not going to go as far as to say that "you don't know computers." IMO, I think that that's a rude and unhelpful comment to make. I was using computers for 6 years before I really began learning how to troubleshoot the hardware side of them.|
Do you by any chance have any PCI/USB devices installed? If so, remove them. Also try booting with one stick of RAM at a time installed, making sure the RAM is seated firmly in the slot and that the plastic clips on the sides of the RAM are all the way up (you may have to push them up with your finger). If it freezes with the first stick installed, turn off the system, unplug it, ground yourself, remove that stick, and try the second stick. If it still freezes, just for kicks, try the 3rd and 4th sticks individually. If you still have problems, install one stick in the second RAM slot (some motherboards allow this, some don't; if yours doesn't, it will emit a beep code that means no RAM and will refuse to boot). If it boots again but still freezes, try a different stick one at a time in the 3rd and 4th slots individually. RAM and RAM slot problems are very common. Your symptoms highly mimic RAM and RAM slot problems.