I've read through the post, but Im not sure if you have tried this. IF the problem is the CPU, you can start troubleshooting by pulling the power and connection to One piece at a time. So pull the Modem, and reboot, if it does the same thing, turn it off, and put the modem back in. Now pull the Network Card, f it does the same thing, turn it off, and put the Network Card back in. Now pull the CD ROM.... and so on. If pulling all of the hardware out and booting still makes the Computer do the same thing... then it will be the CPU. It upsetting... but that is usually what it is!