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- Stop Overclocking your CPU.
- Make sure your Heat Sink is placed properly above the processor.
- Clean the Processor fan, Heat Sink and other peripherals.
- Use High Speed fans.
- Use CPU Heat Sink Paste in the processor.
- Fix OS registry with reliable program like I always use Reginout.
- Shut down your computer at least two hour a day.
Have you checked the power supply in different system? If yes then first replace CMOS battery and switch the CMOS battery jumper. And while doing this please unplug the hard disk or optical drive data cables and power. If it does not work then check the power switch is working or not or it is perfectly connected with the front panel PINS on the motherboard. If it is not connected perfectly computer will not start after pressing power button.
Second Level Test : Remove the CPU Fan - replace the CPU perfectly - again place the Fan.
Third Level (motherboard test): Just take the motherboard removing CPU,RAM, SMPS - use another same type CPU, RAM and SMPS - if it does not work so it is motherboard problem. If it works may be CPU problem.
There are usually three wires on a fan to connect to mother board 1 red "+" positive, 1 black "-" negative and 1 yellow which feed the bios with information about the fan, i.e. how many rpms it is running at. To check the fan you will need to open the pc by taking the side panel off, you should do this when the computer is running or you will not be able to check the fan is working or not, but be carefull not to touch anything inside the case. If the is not spinning check the cable is in the socket properly by turning the computer off first, if it is you will need to replace it, other wise the processor will burn out. If the fan is spinning then the bios is not receiving the infornmation from the fan, therefore you need to shut down the pc and unplug from mains and check the cable(give it a littke wiggle) and make sure it is making a good connection, try blowing any dust of the connectors, power the pc again and if the bios is still giving you the same message you will definatly need a new fan, you can by them from any pc store, take the old one with you to ensure you get the correct size fan.
You should still be able to connect the 3 pin connector of the fan to the 4 pin connector on the mobo, the keying tab is offset so that you cannot connect it to the wrong pins.
If you still don't want, or can't connect it there, simply go on the Bios (press delete after you turn on your computer) and you will find an option to monitor CPU fan speed.
If you need any more help, let me know
the things youre describing that are not controlled by the same power connectors. the 1st set that works are powered i think by the main large rectangular power connector. the stuff that's not working require more power connections. the cpu fan has a small wire that connects to a small connector on the motherboard right near the cpu. the optical drive connects to one of the the 4 pin power connectors coming from the power supply, same with the hard drive- same power connector. the front usb light is going to connect to a specific tiny 2 pin connector on the mobo, it will be labeled with tiny white letters-- try to find or download the manual. godo luck!
you have to do exactly what the system is saying Your CPU fan connector is loose or there is a problem with your CPU fan if You are well-versed with the hardware part of the system you can do it yourself Or call Your PC administrator or who repair Your PC
I supose the fan works, you then need to enter bios and disable cpu fan monitoring, if the fan doesnt spin connect it to another fan connector or a plain 4pin molex connector / might require a adapter.
Try to get into bios and disable cpu fan fail alarm, keep the temperature alarm on 80 or 70. so it will yell if it gets too hot.