Thanks for your help. I'll try reseating the processor.
It is out of warranty and yes I already looked at the prices on new motherboard and/or processor.
I have the same exact problem on the same model. Really looks like a poorly designed or badly assembled motherboard. Would think Dell would assist with this issue! I know that they extended the warranty for the motherboards on other models (personal experience) when a similar think happened!
I, too, have the exact same problem with my Inspiron M5010 - less than two years old. I didn't purchase an extended warranty. Has anyone had success with Dell assisting with this? I can't believe they are making laptops that can't even make it two years.