Question : Problem: System freezes when moved.  What components can be checked on motherboard and how?

Sony Vaio Model PCG-4C1L freezes when moved.  System boots fine as long as I don't move laptop its ok any small movement system freezes and reboots.  Fan does not function but temporarily using external fan but same problem. System freezes when laptop moved.  Any ideas what could be causing this on the motherboard. Any routine for checking motherboard components?

Answer : Problem: System freezes when moved.  What components can be checked on motherboard and how?

Or bad memory or bad motherboard.  Bad solder joint possibly?  Could well be but which one.  If you had the time and patience and skill you could touch all the joints with a soldering iron but it still looks like a shop job.