Hey everyone, Long-time reader here, first-time poster. This forum helped a lot with my recent decision to upgrade to the hexacore Mac Pro, but I'm already having a little bit of trouble with it. Sorry to take advantage of you guys like this, but I figured you were the best place to turn before I have to start calling Apple Support. So, I just set up my hexacore Mac Pro with stock ram and the ATi 5870. To go along with it, I purchased two Dell u2311h monitors from Dell so that I could finally have dual displays. I then purchased two 6' minidisplayport to displayport cables from Monoprice. Also went with the Apple wireless keyboard and Magic Mouse. Upon initial start-up, everything worked fine. The monitors needed to be calibrated, but dual display mode worked perfectly without any extra steps. I had some fun messing around for a little bit and then decided to take a break. I put the computer to sleep. I came back 15 minutes later (couldn't stay away for long), and clicked the mouse to wake the computer back up. I heard the tower humming, but the monitors stayed black. I tapped the keyboard. Still black. Assuming it was some issue I wasn't prepared for with the wireless peripherals, I futzed around with them for a while and had no luck. Still not image on the monitors. I turned the monitors off and then back on only to get an error message explaining that the monitor was in Power Save mode. Some further exploration revealed that the monitors were allegedly getting NO SIGNAL from the computer. Restarting didn't help any. The only thing that has "worked" is shutting down the computer and connecting a single monitor through the DVI-D cable that came with it. Both monitors work, but obviously not together. In doing some research, I've found some threads on different sites about people having similar dual display issues attributed to faulty graphics cards. I certainly hope this isn't the case, but aside from two faulty cables (and I've never had any trouble with Monoprice cables in the past), I'm at a loss for what the problem might be. It seems odd that dual displays would work briefly only to fail after going to sleep for 15 minutes. Sorry if this is the dumbest question ever. Is there something stupid that I'm doing wrong? Anyone have any insight? Any guidance you guys can provide would be greatly appreciated. Thanks in advance!