I built a computer not long ago. The power supply has a little bit of power whine. Sometimes my start up items don't start up. I've had a few usb issies from the front case ports. And recently on start up my video was affected. Got a strange grid pattern accross the screen yet everything was working, could see past the grid, see the desktop etc. Usually graphics card works flawlessly with good performance. Could it be a psu problem?