I've just installed my new Asus M4A78LT-M motherboard with a new Corsair 650W TX series and it won't boot up. The motherboard's LED light is on and when the power button is pressed all the fans, hard drives etc seem to be working. The power button on the front of the case doesn't seem to be lit when it's turned on; the power button doesn't let me switch it off, i have to turn off the PSU at the back. Don't know what's wrong with it, please help!

Http://www.asus.com/product.aspx?P_ID=exJL00uovTJaDqxR
http://support.amd.com/us/Pages/AMDSupportHub.aspx
The first link is an Asus site where you can get the most current drivers. The second site is AMD's site where I would go to download your drivers. The fact that you don't have any display is probably because of the way it's hooked to monitor or when you hooked it up or, if you changed the way it was hooked up. Try diconnecting monitor/lcd from back of computer and plugging back in, then restart. If that doesn't work, if you ever had a picture, see if you can do a system restore to when you did have a picture. If you get a picture, uninstall all software through Programs and Features. If you have Catalyst Control, do an Express uninstall to remove all hardware. For new hardware, go to second link(AMD drivers). In the top right corner there is a window"Download Drivers",
1 Componenet Catagory-click on arrow on right, scroll down and select "Motherboard/chipset and select
2 Product line-click on arrow, scroll down and select"Radeon 3xxxx series and select
3 Product Model-click on arrow and select"Radeon 3000 Series"
4 "Operating System" click on arrow and select your system.
Click on "Show Results". This will list your drivers. Click on first one to download. It will ask you for either "Express" or "Custom" install click on "Express". Finish download and restart.