New Giga i5 machine wont boot - power cycles Tags: New Build Intel i5 Power Systems Last response: January 1, 2010 3:55 AM in Systems Share ronslam December 31, 2009 8:58:21 AM Just built a machine based on a Gigabyte P55A-UD5P board with an Intel i5-750 cpu. On powering up the Phase LEDs all light up for less than 1 second then the power goes off. This cycle repeats every 5 seconds. It doesn't get as far as a POST beep. It behaves the same way with or without RAM or graphics card installed. Any suggestions More about : giga machine wont boot power cycles boonality December 31, 2009 9:08:25 AM Do you have a power supply to swap and test? I have seen a similar issue and it just turned out to be that not all the power cables to the mobo/gpu were seated correctly, so that's one thing to check real quick. jitpublisher December 31, 2009 10:36:37 AM Yes. Read the stickies at the top of this forum. Related resources Asus P8Z68-V: Machine won't boot - Forum No post, power cycles on its own - Forum HELP!! Computer power cycles on and off nonstop! - Forum GA-EX58-UD4P won't POST, cycles on startup - Forum HP Pavilion Power Cycles then boots - Forum Can't find your answer ? Ask ! Get the answer ronslam December 31, 2009 10:46:09 AM Thanks - reading stickies now (first time on this forum) Tried with PSU and CPU only connected and same behaviour. A short or faulty PSU seem most likely. I'll have to try and source another PSU ronslam January 1, 2010 12:49:27 AM I tried another PSU - no change. Tried taking MB out of case - no change. The only change is if I connect the ATX cable the LEDs and power stay on for longer - maybe one second, instead of going off almost instantly. Any more ideas out there? ronslam January 1, 2010 3:55:19 AM SOLVED..... by loosening CPU cooler screws (Thermalright Ultra 120 with backing plate) Can't find your answer ? Ask ! Publish Related resources MSI P67A GD65 power cycles on and off Forum Budget flight sim machine Forum New Build Does't Post. Power cycles on and off. Forum New build, need help with components. Forum New P55 won't power up properly Forum Bally MPU .. I only get 4 flashes, cycles 3 times and then.. Forum Activating RAID on my Giga DQ6 Mobo won't let WinXP boot Forum I5 2500K 4.7 GHz stable in Prime95 but fails during boot up Forum PCI compatibility question Forum $1000 or less multi-use machine Forum New build not sure Forum Tired of the issues, NEW BUILD! Forum [Solved] Power Supply = DEFECTIVE??? Plz Help asap Forum Need a new server/gamer power supply Forum [Solved] New Build. Help choosing components. Forum More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !