Hello, I recently purchased an Asus K8SMX Motherboard, along with a Socket 754 AMD Sempron 2600+ Retail Box. I installed the motherboard, and the CPU like normal, attached all the wires, the PSU, the ram etc and I ran it bare bone at 1st to see if it works. I pressed the power button, it "turned on" but didnt "boot successfully", i.e the monitor kept saying "No Signal" and no beeps are heard. The CPU fan is running while the PC is on and the Green Light on all ASUS motherboards which shows the PC is on is also running. Since then I've done the following: 1) Tried it several times by removing the power cable and trying a different one and generally turning it off and turning it back on, (Also note that i can't use the power button to turn the pc off i have to switch it off directly from the PSU). 2) Tried a working 512MB Corsair DDR400 ram chip from another PC. 3) Tried a different known working 450W PSU. 4) Because the original VGA card was onboard I also tried a known working AGP graphics card. 5) Tried clearing CMOS by the jumper settings and removing the battery several times. 6) Tried running barebone i.e just CPU, RAM, PSU, Motherboard, and only Power Switch Wire attached. 7) Moved the motherboard from outside of the case and running it outside of the box. 8) Tried both ram slots. 9) Tried different combo's of known working hardware (i.e AGP graphics card with Corsair RAM, onboard graphics card with Corsair RAM in both slots, the original RAM with the PC with both graphics cards, another old ram chip with both graphics cards.) 10) Tried a different monitor which didn't work either, (on one monitor i get just the orange light, on another i get no signal..) None of these options worked! What else is there to try? Both the motherboard and CPU are brand new. Specifications: Motherboard: ASUS K8S-MX Specs: Genuine Windows is authentic Windows software that is properly licensed and legally installed. Learn more about the special benefits reserved for genuine Windows customers by visiting Genuine Microsoft Software CPU - Socket 754 for AMDTM 64 processor with built-in MB L2 cache - Sempron processor with built-in 256K L2 cache - AMD 64 architecture that enables simultaneous 32-bit and 64-bit computing Chipset SiS 760GX SiS 965L Front Side Bus 1600 Mt/s Memory 2 x 184-pin DIMM sockets support max. 2GB DDR 400/333 non-ECC memory VGA Integrated Mirage2 graphics in SiS760GX chipset supports DirectX8.1 upto 128MB shared video memory Expansion Slots 1 x AGP8X 1 x PCI Express X1 2 x PCI Storage/RAID SiS 965L South Bridge: - 2 x Serial ATA, RAID 0, RAID 1 - 2 x UltraDMA 133 LAN SiS 190/191 MAC + Realtek RTL8201CL 10/100 LAN PHY Audio ADI AD1888 SoundMAX 6-channel audio Codec support S/PDIF out interface USB Max. 8 USB2.0 ports Special Features CrashFree BIOS 2 EZ Flash MyLogo BIOS 4Mb Flash ROM, AMI BIOS with enhanced ACPI2.0a, PnP, DMI, Wfm2.0, SM BIOS 2.3 Back Panel I/O Ports 1 x Parallel 1 x Serial 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x VGA out Line In/Line Out/Microphone ports 1 x RJ45 4 x USB 2.0/1.1 Internal I/O Connectors - 2 x USB 2.0 connector supports additional 4 USB 2.0 ports - CPU / Chassis FAN connectors - Chassis Intrusion connector - Front Panel Audio connector - CD/AUX connector - Game/Midi connector - SPDIF Out Connector - 20-pin ATX Power connector - 4-pin ATX 12V Power connector Support CD Drivers ASUS PC Probe ASUS LiveUpdate Utility Anti-virus software (OEM version) Accessories User's manual 2 x Serial ATA cable 1 x UltraDMA 133/100/66 cable 1 x FDD cable 1 x I/O shield Form Factor MicroATX Form Factor, 9.6"x 7.6"(24.5cm x 19.3cm) CPU: AMD Sempron 2600+ Socket 754 RAM: 1) Corsair Value Select DDR400 512MB (Tried after), 2) Generics DDR333 512MB (With PC) Hard Drive: 80Gb Maxtor DiamondMax DM Plus9 ATA133 7200rpm Hard Drive (Not attached while testing) CD/DVD Drive: Gigabyte CD-RW Writer/DVD ROM Combo Drive (Not attaching while testing) Power Supply Unit: Win Power ATX 450W (used while testing and a different one used while testing) Also take a look at the pictures i took below, they might help.