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 | E-mail me updates | Report abuse Register or log in to remove 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. | Report abuse jitpublisher December 31, 2009 10:36:37 AM Yes. Read the stickies at the top of this forum. | Report abuse 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 | Report abuse 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? | Report abuse ronslam January 1, 2010 3:55:19 AM SOLVED..... by loosening CPU cooler screws (Thermalright Ultra 120 with backing plate) | Report abuse Register or log in to remove Ask the community Publish Tom's Hardware>Forum>Systems>New Giga i5 machine wont boot - power cycles> Related ressources: ForumAsus P8Z68-V: Machine won't boot ForumNo post, power cycles on its own ForumHELP!! Computer power cycles on and off nonstop! ForumGA-EX58-UD4P won't POST, cycles on startup ForumHP Pavilion Power Cycles then boots ForumMSI P67A GD65 power cycles on and off ForumBudget flight sim machine ForumNew Build Does't Post. Power cycles on and off. ForumNew build, need help with components. ForumNew P55 won't power up properly ForumBally MPU .. I only get 4 flashes, cycles 3 times and then.. ForumActivating RAID on my Giga DQ6 Mobo won't let WinXP boot ForumI5 2500K 4.7 GHz stable in Prime95 but fails during boot up ForumPCI compatibility question Forum$1000 or less multi-use machine ForumNew build not sure ForumTired of the issues, NEW BUILD! Forum[Solved] Power Supply = DEFECTIVE??? Plz Help asap ForumNeed a new server/gamer power supply Forum[Solved] New Build. Help choosing components. More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !