New KT4AV-L motherboard will not boot

I have replaced my motherboard and processor and when I try and boot up it beeps several times and the D-Bracket goes through several combinations and ends up at
green 123 red 4 which according to manual is Testing RTC
the state before this is red 1 green 234 according to manual is boot attempt
the monitor stays in standby and never goes to green light
I have tried flashing cmos with no change
KT4AV-L
Athlon XP2400+ fsb 266
power supply DR-A300ATX
Geforce2 MX400 64Mb
2x 256Mb Dr2100
Any ideas what it could be would be appreciated
thanks
Steve

apologies i meant clear cmos
psu is
Deer Company Ltd
+3.3V 20A
+5V 30A
+12V 10A
-12V 0.8A
-5V 0.5A
+5VSB 2A
another thing I saw in manual was that it supports 1.5V AGP videocards and no mention of 3.3V, not sure what voltage my old geforce2 is.

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