Before buying: Confirm with the owner that no passwords are present on the system.  Also, since this is a 4-year old system, confirm that the owner will replace the battery with a new, OEM battery (or plan on doing that yourself).  At 4 years old, the battery will be at or near the end of its life. Similarly, plan on needing to open the system for a thorough cleaning and replacement of the thermal pads unless the seller confirms that has already been done. You're buying a system that's already at or beyond its design life -- make sure the purchase price represents that fact.  
Hey there I see a Latitude 7490 in good condition for a good price. I am seriously considering going for it. Can anyone whom owns one tell me how the battery life is? How is the fan noise and thermals of the laptop? Any major issues?Thanks!
Latitude 7490