Hmmm, i only ask because i got a new power supply for my k7, 800 Tbird-- r2 r3 r4 r5 all red. After 3 to 4 seconds, off. On the msi Diagnostic led Card four red led's mean system power on. if system powers off after four seconds it might be a bad power supply, and i did say MIGHT BE. A red green green red led is the processor initialization. I replaced it with another power supply and bingo. another power supply might be worth a try BUT please dont spend the money on my word. Just letting you know what worked for me.