okay, so if you want us to try and give you a solution then be a bit more specific please and "define", "i upgraded my PSU and MB".
1. Did you reinstall Windows? it is stronlgly recommended when you upgrade your MB to reinstall Windows.
2. if you didnt take step 1, then you atleast tried to uninstall the old drivers (mobo drivers/chipset and video drivers) and isntall new ones?