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Try removing the CMOS battery and wait 2 minutes, then replace.
Check the voltage before re-installing it.
Also, check and reseat the memory and processor.
While you have the board out, you should check all the USB ports for pin shortage.
Hope this helps.
The problem is in the processor or in the board to check first change the processor sutable for the socket and switchon the computer still the computer doesnt work check the secondery power supply thats four pin from the smps to the motherboard check all the FET and the capacitor in the powersupply also the 32khz crystel and the 14.182khz crystel and the clock ic
This is an issue that one of the devices is not properly seated on the board or it is not detecting them correctly.
1. Remove all devices from the board. All cables coming from Hard drive/CD-rom. Remove the RAM and processor. LEAVE TH E POWER SUPPLY CABLES CONNECTED TO THE BOARD.
2. Re-seat the processor on the board.
3. Re seat the memory on the board.
4. Now re-seat the video card making sure that you push it firmly in place. Connect a monitor to the video output.
Try and boot the computer. If it boots and you see output on the screen then the issue is fixed. If if does not boot you have a problem with one of the following: RAM, Processor, Video Card, or motherboard.
It's a bad power supply. Couldn't be a bad Power On switch, because it turns on for 2 seconds.
You have to have Ram to get the computer to function, besides the processor. All you will see is the BIOS Setup screen.
Been using the same power supply?
The power supply has bad Electrolytic Capacitors in it. These bad 'Caps' in turn make a weak voltage rail. You have three main voltage rails inside a computer power supply. The 3.3 volt rail, the 5 volt rail, and the 12 volt rail.
With a weak voltage rail, the processor won't have enough power to run. ALL the lights, (Lamps), use less than 1 Watt. EACH fan uses 2 to 3 Watts. Processors use 55 watts to 125 Watts. Depends on the processor.
anniegms, I had the same problem with a new Asus board running a Dual Core Duo Quad processor. The boards BIOS was not updated to handle the Dual Core Duo yet. I had to switch processors to a P4. Use a different PC to make a BIOS update disk. Update the BIOS and switch processors back. But I had all the same symptoms of yours. However I did/do have a PCI-E XFX Fatality (Nvida) based graphics card. I would check or swap processors, it sounds like the board is waking up but not the processor. Just my thoughts.... PCdok
According to this list on GigaBytes homepage http://www.giga-byte.dk/Support/Motherboard/CPUSupport_Model.aspx?ProductID=1406 You'll be fine for quite a while, until the 478-socket processors are available in stores. Your motherboard supports much faster CPU's than your current Celeron, so if money is short upgrade our processor. But if you want to secure your motherboard for future upgrades, then I suggest you get one that support the newer dual-core processors, and PCI-Express instead of AGP. Allthough you can still get pretty good GFX-Cards on the AGP-standard the PCI-E standard is the future.
Try removing all unneeded hardware leaving only the core components needed to see your board post (processor, memory, motherboard and external video if your board doesn't have onboard) see if it now posts. check to make sure your hardware is installed correctly (memory is seated and processor & heatsink are firmly inplace) Is your new board bigger than the old one? does it make any contact with the case behind the board causing it to short? You could also try your processor in another board. Good Luck