I have abit kn9 sli mobo the issue is there is power on mobo but doesnt show up on the pwr led connector on mobo i tried manually to jump it and it doesnt work.....

Check your codes here:
http://www.computerhope.com/beep.htm

So after 5 seconds it won't come on again at all, or it runs for 5 seconds each time? What else do you have running on this computer? I'd suggest disconnecting all non-essential devices (hard drives, all but one memory chip, any expansion cards other than video) - if one of them has a short, they can pull down the power supply (regardless of the condition) and cause it to shut off exactly as you've explained. Let me know if that makes a difference (it obviously won't boot without a hard drive, but it will get far enough to see if that's the problem). If that doesn't make a difference, let me know and we'll try something else.

Try checking the jumpers on the motherboard. A lot of the SLI compatible boards have jumpers that need to be configured properly. You can find out the positions by checking the motherboard manual. Are you using an SLI capable video card or is the video onboard? I just ask because I had the same problem once while trying to install an SLI video card. I had no picture on the monitor and I couldn't figure it out for the longest. Finally I found the answer in the motherboard manual and it turned out to be a jumper that was set wrong. Hope this helps.

motherboard has user manual try to read it again, if you do not have manual then use a magnifying glass look for word abbreviated: Pwr- power switch, Re-re-set power, Hd- hard drive etc.. this is where you connect the wire, LED light etc.

Are you sure the 4 pin connector is going in correctly? Some motherboards have an 8 pin socket, and the connector can be placed in improperly. The symptoms you describe indicate a dead short on the power line when plugged in.

ur mobo bios must be corrupted update it, this will solve the problem

The problem could be a failed electronic component, and no cooling remedy will solve the problem. When some components fail, they result in high heat conditions.

Hi,
Usually the sound is called bios beeps. They let you know in advance if there is a problem.

Usually a high low bios signal ( like an old german siren) means a cpu issue.

Check the processor and cooling fans, and check it's temp....take two aspirins and call me in the morning...LOL :)

Hank

try here http://www.abit.nl/ you might find what you need ;-)

Ok, try connecting just one thing at a time - start of with just your board and the power supply... still smell burning? There's probably an issue with the power supply - no fans & leds would indicate this too (can you hear anything when you power up?)

What cooling have you been using - weird quetion, but is there any chance there could be moisture on the board? (either from water cooling or from condensation in the room)