Computer continually turning on and off

Good afternoon. Earlier today, I decided to open up my PC and do a little bit of dusting. I took out the GPU and CPU to make sure I got as much dust as possible, but after I re-seated everything, it won't start. What'll happen is when I press the power button, it'll light up and turn on for 3 or 4 seconds and then it will turn off for 3 seconds and turn back on and it'll keep doing this until I manually switch it off on the PSU. I've tried resetting the CMOS, taking out and putting the battery back in, and even trying a different PSU/GPU, but to no avail. Maybe it's the CPU? Do I need new thermal paste to re-seat it properly? I didn't peel it off of the heatsink, but I'm just wondering. It might be the mobo because that, the RAM, and the HD are the oldest parts (3-4 years old) in the computer. The CPU and PSU are pretty new still. Any information/help would be appreciated. Thanks!
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More about computer continually turning
  1. If you removed the CPU Fan/Cooler you MUST clean the CPU surface and apply FRESH / NEW Thermal Paste/Compound.
    If you skip this, THAT is the first thing that you must do before anything else.
  2. I will leave soon to pick up some thermal paste and see if re-pasting it to the heat sink will help.
  3. On newer mb if the mb can't set the ram speed it fall into a reboot loop. Check that ram is locked in and in the right dimm slots.
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