Computer restarts on boot up????

[nick.lidgett]

Hi guys i built my new rig about a week ago and everything was peachy but yesterday it start doing something wierd.
When i powered up it would restart 3 times (before the bios). On the third restart it contined to load past the bios screen. (this morning there was only one restart)
Now i have not added new hardware since the original build and im 99% certain everything is working so what can be the problem?

 

[nick.lidgett]

It could be a memory problem. Try removing a stick at a time and seeing if the problem disappears

Done this and it seems to have cured the problem, cheers buddy, though im not convinced it will not reappear in the near future. It went away as quick as it came, last two boots have been fine.

What can cause this, if it was the ram? i mean it has not been touched since the build.