I'm doing my first home build and I'm having an issue getting it to boot up with my ASrock z68 motherboard. I have nothing but the PSU and motherboard hooked up, but when I try to start up the fans start up for about a second or two and then shut down, then pause for a second or two before trying to start up again and this would repeat until I turn it off. Here's the thing, I was told that the heatsink would come with a bit of stock thermal paste on it so I didn't apply any of my own, could this be causing it to overheat immediately and shut off? I've tried it with two different PSU's and the exact same problem happens. I removed the heatsink and there was definitely some silver paste on both the CPU and bottom of the heatsink, but I don't want to keep trying to boot it up and damage the CPU.