Increasing system memory is usually the cheapest and easiest way to increase system performance.  However, not every system can be upgraded and it is possible that you may already have the optimal amount of system memory for your hardware/software configuration.

Frequently a system that will not power-up may have inadvertently become unplugged or possibly a cable may have become loose.  The following checklist is intended to eliminate a power connection or disconnected cable as the cause for a system not powering up.