Running out of options with a home built rig, designed to be a media centre. The Problem: . When I turn it on, the fans (PSU fan as well) start for a second and then turn of for a second, then just keeping going on and off until I turn off at the PSU. The Computer. Intel E6300 cpu Gbyte 965-DS3 m/b Coolermaster 430W igreen PSU Corsair DDR2 twinX 1gb ram 250gb Samsung sata2 7200 HD Alaska AK920 heatpipe cooler Pioneer DVR111 256 gigabyte 7600PCIe Pinnicle PCTV dvb-t tuner XP MCE.2005 The History Built it without a hitch, booted fine and worked good (was having some pinnacle hi-cups) for about a week. Moved the machine about 6 inches and when I tried to start it the above happened, presumed I shook something lose so checked every connection and card—the same result. Stripped it down completely and re built—same result. Built it out side the case—same result. Removed one component at a time and tried each time—same result. Took right down to motherboard, CPU and PSU,—same result. Did the same with a replacement PSU—same result. Ruled out on/off switch by shorting pins on m/b. I then got on to suppliers who suggested a motherboard fault and I sent motherboard, CPU and PSU back for testing. They have now returned them saying each item tested individually and together and no fault found. Guess what I’ve put them together and of it cycles on/off/on etc. It must be me but just don’t know what to try, have seen similar threads on this and other forums- but never an answer, please help. Sorry this is so long but have noticed "helpers" seem to often have to ask for more info.