Mobo: Tyan Thunder K8S - S2880 CPU1: installed AMD 242 Opteron CPU2: none Memory: installed DIMM1 Infineon PC2100R (256Mb,DDR,133Mhz,CL2,ECC,Reg) Power Supply: A+GPB Power 500W EPS-12V (Tested OK, stand-alone by vendor) Problem: On power-on, the KBD leds flash once, the CPU fan and the PS fan do not start, no beeps from POST. How should I proceed to test this situation? Is this a mobo short or CPU short? Thanks for any suggestions Tony Borras