Before you try reinstalling the OS again, I would suggest to disconnect all the cables inside the case and only connect the ones that are important. For example, if you have more than one hard drive only use one that you are going to install the OS on.
Secondly, don't occupy all the ram slots just install 2 modules for the time being. Thirdly, if you have any expansion cards (eg sound, tv tuner) remove them and only leave the important one eg Graphics card.
Make sure all power cords are properly connected to the connectors on the board. Make sure the CPU fan is spinning and nothing is obstructing its blades.
Reset the bios by removing the battery from the socket on the motherboard, switch on the computer for 5 seconds, then power it down and back up again with the battery on the socket.
Re-enter the bios. Adjust only the important settings, like Time, boot sequence (1. CD-rom, 2. Hard-drive), save and exit the bios.
If you are still getting blue screen, try replacing the sata cables.