I would definitely check the connectors for signs of having been over heated due to loose or high resistance connections.
It just has all the markings of a power or connector problem of some kind. Check the drive connections too, at the mobo and the drive.
Timmi wrote:I would check the memory.
When a system starts to "grow", as you build it up in software applications, it starts to use more memory, venturing into areas that may have been unused when the system is fresh.
You didn't mention if you got any error message when it froze. If you did, such as "error at xxxxxxxx" then you are 100% certain it's your memory, but the absence thereof doesn't mean it's not that.
If you have memory chips of different brands, even if they are rated at the same speed, they will not be identically the same speed, and that WILL cause problems in fast systems.
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