I just purchased a Lenovo S340 laptop from Costco. During the first day of use, after coming out of sleep mode, the entire laptop screen was a greenish color. Nothing would make it change color. I also had a monitor hooked up to it through the hdmi port and my monitor was not green. I then restarted the laptop and have not had the issue since then (2 days). I have a 90 day Costco return window and I don't want to even risk letting that time elapse if it is a laptop screen issue. Thanks.