vladimirb

Hey mate,
about those dots, plug monitor to your friends PC... Run Screen Saver or something to see if those dots are still there on display... If they are there, then you have dead pixels...

Open the case and take out graphic card... Clean connectors with rubber and PCI-E slot with brush... Put back graphic card...
Also, download latest graphic drivers and install them [make sure you uninstall old ones]

Last thingy, what make/model is your PSU???
Report back please...