Need Help Asus A8N-SLI Deluxe

Build a new system wich worked perfect for 6 hours. flashed bios to 1011 for x2 support and new video drivers. For my asus 6600. after a normal shutdown from windows i came to turn the system on the next morning and… NOTHING. nothing at all. no fan noise no boot up nothing. The green light is on. please help…
I tried different startswitch but this did not help. also tried just the mb/cpu+fan/ram and videocard.
nothing is overclocked.

Could be the power supply unit. Which PSU are you using?

Antec Truepower 2.0 550 watt

Found the problem it was my internal modem … Once it was removed bootup was fine so now have to get external Modem …

Nice to hear you have the thing up and running again.