I have a desktop Compaq Presario with 4GB RAM (purchased in 4/2010) that is running Windows 7. If I replace the 250 Watt Power supply with a 300 Watt one, will I blow up my motherboard? I have a laptop running Windows 8.1 and it does not have the programs I need (Movie Maker, DVD Maker, etc), so I need to keep this one as long as I can.
The wattage of the power supply is an indicator of how much power it CAN output. Your computer will only draw as much power as it needs. If your computer draws 210 Watts, it will draw 210 Watts no matter how big of a power supply you hook up to it.