My U2410 is not going to power saving mode when connected through DP if my computer is put to sleep or shut down, it says "no Displayport cable". I tested this with VGA and DVI to DP connections, they all work fine, just when I connect through DP it does not got to power saving mode. I know it is not my computer's fault because I did another test with my U2711 using DP and the u2711 goes to power saving mode. My question is whether this is normal for all U2410 or just my particular u2410 is faulty because it does not recognize DP cable when the computer is shutdown. Should I call Dell for an exchange or last resort a refund.