Check your motherboard and make sure the CPU fan is functioning normally.

Internal components such as case fans, CPU heatsink fans, and power supplies are often available with built in lighting.

Most builders will do quite well with the retail CPU fan (and that 3-year warrantee doesn't hurt either).

Is your CPU fan plugged in (we don't want to fry anything!)

The CPU fan can now be swapped out for another drive cage.

If you're setting up a slotted box, hook the CPU fan to the 3 pin header somewhere nearby and you'll be done with phase 1.

Some motherboards are designed to use the secondary airflow from a standard CPU fan to cool other heatsinks, such as the northbridge.

It had finally suffered a failure of CPU fan and crashed.

After replacing the CPU fan, the PC still did not boot up.

Some chassis may provide enough airflow for God Box builders to omit CPU fans, but we play it conservative here.