P45D3 Platinum - DLed is full red but the CPU is OK

Hello,
After I organized the cables inside my PC case the MB (P45D3 Platinum) could not start. The D-Led was red completely and did not change even after some restart, reset or power cycle. All other blue leds lit.
I performed CMOS reset but did not work. I minimized the config to PS, MB, CPU, 1xRAM, VGA and freed up all the cables but the problem remained. I tried both the RAMs separately I have - no change.
Then I tried the CPU and the VGA in my son's computer and found them OK. But I could not try the RAMS as I have DDR3 and his PC supports only DDR2. This is the current status.
Can anyone advice something to find the cause and solve this problem?
Thank you in advance.

I already assembled carefully my PCs components on the tabletop and checked its functionality - as I wrote in my previous mial. Quote from: BigRega on 12-November-09, 02:46:27
Then I disassembled my PC and built the minimum config on desk but no change after power on.
Still no success. 
I believe that only one rail can be enough for the MB and the CPU (12V x 15A = 180W by the first 12V rail) as the CPU (E8400) is a 65W model.
The VGA needs 2 x 75W = 150W (by the second 12V rail) from the PSU. The fans require 4 x 8W = 32W, the HDDs & DVD R/W 4 x 10W = 40W (72W by the third rail).
The total required power is 402 W. I do not believe this power is provided by only the 12V rails but the +5V & +3.3V (141W) rail and by the other ones (9.6W +17.5W).
Do you agree with this calculation? 
Another thing: why this config worked for 2 months properly if the PSU is not enough?  :smiley:
And I would still like to known what is the led3 for? Is it an error signal if this led lits red? 
Thanks for your answer in advance.

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