Whatever works then, right?
Glad you got it working-
Dave
Hi Dave,
Since my last reply, the shutdown problem came back but only on really long runs. I'd also asked about this in other places and found out that while the C640 is a well regarded laptop, it does have cooling issues and I was advised to strip off the keyboard and check whether the heatsink had become detached from the CPU and it had, partially at least plus there was a lot of dust and fluff in the cooling vanes. Cleaned the cooling system, added some new thermal grease and put it back together. I've been running it very hard over the last two days and had zero problems. I think we can add the Dell C640 to the list of Laptops that work with Mach3 now.
Big thanks to PMINMO for the help with RMClock and other excellent advice.
Regards, Jeff.