Summary: Item never worked. Would come on for one half second, then cut off. HP's dismal Tech Support told me it was because I was using it at the wrong resolution. That fixed, it still didn't work. HP then told me the problem was my video card, and offered to sell me a new computer. I thought about that; I needed one anyway, and eventually I bought. Monitor still didn't work and had to be replaced. Now, I understand defective units do occur.