yes you are right.i did mean psu.i have no idea what wattage it is.all iknow is before when you turn it on at the mains it would take a few tries powering up,since i had the new one it starts 1st time.i checked the virtual memory and it says recommended 2302mb and currently allocated 768mb.could this be a problem and if it is could you please help me in fixing it.thank you