PC Fails to Boot

Hi DJ AKSHAY,
My PC is not starting up. no Beep sound, On display I can see some PCB like wire diagramme in upper part of monitor and in rest part the diplay is blane (blue in colour). I have removed, Cleanned and reconnected all the connections, cleaned the mother board. Once in power OFF condition I removed the RAM and then switched on the PC, I hear one Beep Sound and in my openion the mother board is OK (although I am not confident about it).
Inspite of all these efforts the result is same, my PC dosent start, no sound, and the same display. Although LED in the front panel (power and cpu both) continues to glow.All fans are working, LED in the CD and HDD are glowing. Please suggest me the probable solution.
Nitin
(Configuration Windows XP
Internet Explorer 6.0, Intel D845GLLY motherboard, P4 1.6GH Processor, 128 MB SDRAM, 350 Watt Power Supply)