Hmpf! Almost a week old and already broken? My new ACD24" won't work without issues - after a while the screen gets black for about 0,5 sec and this happens every 2-4minutes. It happened already on the first day. I contacted my reseller, he said i should first try to disconnect keyboard/mouse from the usb - but its not better. I plugged in just the 3 white cables between ACD+MBP - and the 0,5sec blackscreen still appears :< i was changing brightness - nothing! Any ideas? Is it really defect? won't wait so long for a new one!