|Please turn off your Caps Lock. No one likes getting yelled at & that's exactly what typing in ALL CAPS means.|
Assuming you're asking about a custom built desktop, here's what we need to know:
- make/model of motherboard
- make/model of CPU
- CPU temperatures at idle & under load
- make/model/wattage of power supply
If the fan you mentioned is the CPU cooling fan, it was probably installed incorrectly. If the CPU temperatures are high, that's the most likely cause. Idle temp should be in the 30s or 40s C (depending on CPU), loaded temp shouldn't be much more than 60C.
If you don't have a temp monitoring program, try OCCT. You can use it to run a load test & watch what happens with the temps.