Report "My Opteka digital picture frame has suddenly stopped displaying pictures. Power is on - there's a periodic "ticking" at about 0.5 Hz, that sounds like it's trying to access a hard drive. There's also a green light that brightens in time with each tick. I unplugged it overnight but that didn't help. I play the pictures off a USB stick, and haven't changed that recently. It was working fine for months, suddenly stopped for no apparent reason. Any suggestions?"