mp10 wrote:

Today I am going to test your solution. Can it be a long term solution or is something to find out the problem?

*If* it works........ It will most likely be a temporary fix.
I say that because good caps would not get this bad in only a year.
However it should repeatable and it -might- buy a couple of years more use before you have to recap.
.

I kept the computer ON during 48 hours (without freezes or other kind of problems) and the situation remains the same. I don't know how I can fix this problem. Any more suggestions?

mp10 wrote:

I kept the computer ON during 48 hours (without freezes or other kind of problems) and the situation remains the same. I don't know how I can fix this problem. Any more suggestions?

Were it me I would replace the capacitors next. But for me that's not a big deal.
If you don't already have the tools and skills that is a HUGE project and there is a lot to learn.
.
Can you give the capacitor brands and series' on the board?
Or maybe some close up photos of the caps that show the markings?
Some have a reputation and should by default be suspect.
.