OK i solved! I made the measurements but it

OK i solved!
I made the measurements but it's all at zero, in fact the fan doesn't start the LED turns on green but I don't even measure the 3.3vsb.
I think the problem is in the difference of the "start" circuit between the two, apparently identical, but different in some parts of the circuit.
the clock was the big question,WHY in the P5B-VM it gave signs of life while in P5B.VM-DO it didn't?
so this last one is broken! and instead NO! circuit differences have been misleading.
working with the P5B-VM all was OK !
Testing the P5B-VM DO, i wasn't able to find any problems ... and i test a lot in "passive mode".

The aswer come out today in the meantime a was searching for information.
the system with P5B-VM start to give problem


and block my PC, also blue screen like was the initial problems of the P5B-VM DO first that i turn off at night
and didn't turn on in the morning .
The point is that for any strange reason, the same components worked on the P5B-VM but not in the
P5B-VM DO, PSU don't turn ON.
that's because the "power on" blocks are different .
The problem was not the board P5B-VM DO (OK i substitute some swollen caps ,and the nine of the CPU that i put polimeric KO, but the problem was the PSU.
I open it and a capacitor was damaged(swollen) and on the board a lot of bad welds that I fixed.
Now all the 2 board works and the PSU is like new, i controlled good.
I wonder, the capacitors i soldered, polymers from 560uf to 6.3v instead of those from 680uf 4v can be okay? for now I leave it.
I ordered them but they still have to arrive.

Thanks Maco !

P.S.
i see that you play with xeon over 3.00ghz, can i throw one on this P5B-VM DO ?
perhaps avoiding burning it :) ?
I would also like to try to install an SSD 1T with XP, my bios see AHCI and it seems XP can work using utility to trim the drive ... is that possible? actually I have a 2Tb drive but it is an incredible slowness(full).
I like XP because he doesn't do "my business", he's not too web-oriented and "social"/pop up. etc... i cant block what i want.

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