New PC does not boot

Clarifications

And make sure that the CPU is correctly inserted in the Socket.

There are to cut outs in the CPU that have plastic lugs in them from the socket to fit the CPU to the Socket. I've seen a couple of Home Builds now where the CPU is incorrectly fitted to the socket and they do this.

Col

This will be a little plastic jumper that sits over two pins, look at/in your manual for this.
Find out if the jumper is seated ok or if it is in the wrong place. Another thing could be a faulty power supply, make sure that you have a psu (power supply unit) around the 7oo to 750 watt range. You might need to check that your 4 pin (12 volt) cable IS properly fitted, many times i had to check mine because of this problem. You will need to firmly press this plug in to its socket. you do not need to fit a hdd as yet, just make sure that you start with around 2gb of ram, if the computer fires up and you can access your bios then all is well. Fit in your hdd and then install your operating system and all of the updates, then the most importantly update your bios, but make sure that you save the old bios on your hdd, you can do this through the bios. Please read your manual for this or on the Asus web site. I have also the similar motherboard as yours and it works fine. The most important is that when you install your processor place a VERY small amount(and i mean a small amount) of thermal paste on to the processor and then fit on the heatsink and fan. Hope this all works out for you.

Please post back if you have any more problems or questions.

One of the biggest problems with new builds is the placement of insulating washers in the right place on the underside of the motherboard. I eliminate this problem by replacing the standoffs with nylon or plastic ones and using nylon screws to secure the motherboard in place. This also eliminates the shorting of the power supply in the future as the unit runs through heating and cooling cycles which will make the MOBO grow and shrink, moving around some on the standoffs. That's what you are seeing is the power supply seeing a short on power up, trying to start and then shutting down. Pulling the plug resets the circuit and allowing another restart.

Thank you very much for all your help and assistance. Yesterday I solved the problem.
I went to the store where I purchased everything and brought them my MB for check. THe guy there advised to remove the battery, wait a little and try again.
I tried that, and it worked!
But when I put the MB and stuff into chassis, same story began.
The problem was in the insulating washers - because of them short circuit happened again and again.
I removed almost all of them and left only four to fix the MB.

Thanks a lot again for your help!