Motherboard wont turn on

Hi, I have a MSI g31m3 v2 s-7529 motherboard and wont turn on.
I change the power supply
I put on some themical paste in the cpu
I put away all hard drivers
but didnt work, only the fan turn on then its turn off
I think the motherboard dosent work.
 
Please provide list of make and model for everything you have for this setup (CPU, RAM, GPU, Hard Drives, Optical Drives, Power Supply, Aftermarket coolers, etc.). We need to make sure that you have all compatible parts.
Also, have you tried to disconnect all things except the power supply connection to the motherboard, CPU & RAM and see if the motherboard starts?
 
Thanks! The hardware are compatible bit ill change the CPU because I didnt do it thanks. Ill tell you later wath hapened.
 
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