Fans are spinning but no display.Mobo faulty?

[Polimorifst]

Hi guys,this is 2nd or 3rd post on this forum so if here its the wrong place please notice me.So here is my story 2 months ago i built desktop system(not the greatest but...) which is:
Mobo:Foxconn A6vmx
CPU:AMD Phenom x3 8600
GPU:ATI Radeon R7 240 1GB GDDR5
2x2GB Ram 800 MHz
A friend gave me this motherboard and i decided to make something with it.The problem with it was that the pc wasnt shutting down.Everytime i wanted to turn off the pc i had to unplug the power cord or to switch off from the psu's button.I did this untill my hard broke,about one week ago.Now the problem is that when i try to start my pc The cpu fan and one 12 cm fan are spinning but i get black screen.Also the gpu fan is spinning for 1-2 seconds then stops.I borrowed a GT440 (2GB GDDR3) from a friend to see if the gpu is faulty but same black screen,but that gpu's fan is totally spinning.I took an older cpu and tried it same problem,also tried with one stick of ram same problem.Also when i start the pc without ram i dont get that beep noise from the speaker so i think the Mobo might be the problem here.Tried my psu on another pc to see if its working properly and it is,I took another psu to try it on my pc but same black screen.
Tried also clear the cmos same problem.
Now im asking you guys if the mobo is the real problem or could be something else.And if you could tell me what else i could try,im all ears. Sorry for bad english tho.

 

[ICIT2LOL]

Hello Poli I know you have checked out the PSU but please do this in my little ditty and post back a pic of the PSU voltage rails
Using HW Info
PART A:
You can test the volts on the PSU with HW Info HWiNFO, HWiNFO32/64 - Download < download the right bit version and close the right hand window select Sensors and scroll down to the power section where you will see what the volts are doing see my pic. In my pic the section (Nuvoton) with VBATT is a dead give away you are in the section for the rail voltages. There are other section titles and one that pops up often is ITE
Now the voltage on the different rails have to be within 5% =+/- of what is required or the machine will not work properly if at all.
See this for the rail voltage info
http://www.tomshardware.com/reviews/power-supply-specifications-atx-reference,3061.html (Section 2.)
The original right hand window shows the machine running and is handy for that but for looking at the components in some detail close it and use the main left hand side panel
FOR OTHER COMPONENTS
PART B:
Open each small square with + in it on the section the components are in and then click on the individual component/s (it will highlight in blue) - in the right hand side will appear all sorts of details including brands speeds and other essential info that particular device. See pic for example.

Use PART A: and as an option you can use a digital multimeter and test the volts on the 24 pin board plug see this for the colour codes https://en.wikipedia.org/wiki/Power_supply_unit_(computer) (scroll to the bottom) use the black lead to any black cable the red lead to the different rails.

Also the board is relatively old too mate so don't be surprised if it has or is going south.

 

[Polimorifst]

Gonna try these,thank you.

 

[ICIT2LOL]

Ok let us know what the outcome is. The other thing you could us is this to calculate the power requirements of your system. eXtreme Power Supply Calculator - The only power supply calculator trusted by PSU manufacturers and computer enthusiasts it will give a you a ball park figure with some leeway and a recommendation too. Most like to build or use a PSU with about 25% "overkill" as rule of thumb.

 

[Polimorifst]

Recommended psu wattage 350w...i'd say 520w are enough.

 

[ICIT2LOL]

Yes mate that is plenty and with that good margin of error if needed eh?