This one has me stumped. I build systems all the time, and have 4 orders\nfor Core 2 Duo systems with the new Gigabyte GA-965P-DQ6 motherboard. I got\n2 of the motherboards from Newegg and the other 2 from ZipZoomFly. I have\nan E6300, E6400 and 2 x E6600 processors to go with them, along with\nDDR2-533 1.8v sticks from Mushkin for all of them. Two of the systems have\nMushkin 550Watt PSUs, and the other two have Antec TruePower2 550s. All 4\nhave different cases, graphics, optical, hard drives, etc.\n\nThe problem:\nAll four builds are giving me the same exact issue. When powered up for the\nfirst time, all of them each power on for maybe 2-3 seconds, then power off,\nthen power on again for another 2 seconds, then power off again...and again\nforever and ever, until I flip the power switch on the PSU. The only\nactivity seen when they briefly power on is that the CPU and case fans spin\nfor a moment. That's it...no graphic output, no BIOS beeps...nada.\nInitially, these symptoms made me think that the motherboard was shorting\nout or a faulty PSU.\n\nWhat I've done to verify what's wrong:\n1. Tried each motherboard outside of the cases as well as installed\nproperly in the cases, making sure that no shorts were happening. When\ntrying them outside of the cases, no case pinouts were connected. I just\nshorted the power button pinouts briefly on each board to start them up, in\norder to rule out faulty case power button connections.\n2. Tried with no peripheral except CPU, heatsink/fan, 1 stick memory and\ngraphics card. Made sure that the CPU fan was plugged in properly on all\nfour boards.\n3. Tried different combinations of known-good memory (single/dual channel)\nin all slots in all boards, as well as different known-good power supplies\nand graphics cards on all four boards. These are standard spec 1.8 volt\nDDR2-533 memory sticks, chosen to run synchronously with the motherboard/CPU\n1066 MHz Front Side Bus.\n4. Checked all PSU connections to all boards numerous times, thinking I was\ngoing insane. Each motherboard has a 24-pin ATX connector, 8-pin 12V EPS\nconnector and a 4-pin standard Molex connector for providing extra 12V to\nPCI-Express graphics cards. All 4 power supplies (different reputable\nmodels) have the proper 24-pin, 8-pin and Molex connectors, and they're all\nplugged in securely and correctly in each motherboard. All graphics cards\nhave the 6-pin PCI-Express power cable attached to each card.\n5. I even double-checked the UPS power sources that the power supplies were\nconnected to, to rule out the possibility of something being wrong with the\nbuilding's wiring. Other working systems, when plugged into them, work just\nfine.\n\nThe only common denominator between all four builds is the motherboard and\nthe brand/type of memory, but each memory stick has been tested in other\nsystems...so I'm out of ideas, except to come to the conclusion that all 4\nmotherboards are DOA.\n\nAnyone have any clues? I did see a couple mentions of the same problem with\nthe same board by Googling forum posts. There is this "CrazyCool heatsink\nthat Gigabyte puts on the back of the boards, possibly shorting something\nelse out on each board, but I'm not going to rip them off to find out\n\nI'm just thinking: one board, even maybe two could be a possibility with a\nnew motherboard release...but 4 in a row from different distributors? I'd\nvery much appreciate any input anyone could provide.