The fan was very durty. We cleaned with a vacuum cleaner. To clean we have separated the fan from the CPU. Once cleaned we put it back. We have put back all peripherals and tried to start. Did not start. Though there is a light close to the power input indicating there is power. We have also erased the CMOS thinking that the computer had an automatic ON control. Thank you for your help. Guido.
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Re: Intel MB D945GTP
Give it 3 hours with no P/S plugged in, it might come back up. I just read a similar post. Dies when you unplug anything "active" from mobo, like fan, drive or floppy. MOBO senses voltage difference and shuts down.
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This is usually dust clogging up the CPU cooler.
When the owner of the PC forgets to clean the fins and the fan of the CPU cooler it plugs up with dust and dirt and looks like the inside of a vacuum cleaner.
There is not enough airflow and thus not enough cooling, so the CPU overheats and the safety circuit shuts the CPU off until it cools down, and the CPU will not reboot the PC until it is cool enough that the safety circuit can reset.
First step remove the CPU fan and check the fins of the CPU cooler. If they are clean, the problem is usually somewhere else.
open the tower/ ATX cabinet and then check the two small power cable pins that connects the power button on the ATX cabinet and the motherboard, remove the same from the motherboards end (make sure you note down from where you removed the 2 power pins and then using a insulated screwdriver short the power pins on the motherboard for a second until you see the power coming on let go of the pins as soon as you see the CPU fan moving if it stays on and works normally it is a faulty power switch on the ATX cabinet and then you can either replace only the power switch or get a new ATX cabinet to fix it
you can also check if motherboard stays on if you remove the RAM chip from the motherboard. if yes its a faulty Ram and replacing the same should do the trick
you can also try cleaning the dust accumalated under the CPU fan and between the heat sink as some motherboard cuts off the power depending on the temperature
also if nothing works you can try using a different power supply unit to see if that's the case,
if still no luck then its time to buy a new motherboard.
If the computer is overheating, you need to give the PC a good clean.
All the fans, the CPU heatsink and fan, case fans, PSU fan and grills.
A small brush (paintbrush) and a vacuum cleaner if you are very carefull is all you need.
You can also buy an AIR DUSTER to blow all the dirt away
Use google to search for YOUTUBE cleaning guides
It is possible that the CPU fan is spinning too slow which allows the CPU to over heat and restarts you're system. (A safety feature for all MB's). Or the CPU fan has built up too much dust. Try cleaning the CPU fan with canned air and a clean paint brush. Try to free the dust from the under side of the fan blades with the paint brush. You can also add a case fan or two. This will supply more fresh air and help keep the MB and CPU cooler. If you're MB is five years old or older it is a good idea to replace the thermal past between the heatsink assembly and the CPU. If you decide to replace the thermal past spend a little more and replace the heat sink assembly too. Socket 423 replacement; http://www.directron.com/cck7015.html#caption
Overheating problem Remove case side and clean all fans remove fan from heat sink usually 4 screws or little clips Do NOT remove heatsink stuck on with heat paste clean vanes in heat sink replace fan use stiff brush and vacuum cleaner to clean outside of power supply vacuum out case include all vent holes reboot computer should work ok replace case side
Remove case side and clean out ALL fans then remove fan from heatsink DO NOT remove heatsink (probably stuck on CPU) clean all fluff and dust from heatsink. Use a stiff brush and vacuum cleaner on power supply fan area then vacuum out case include all vent holes and behind power supply. test start.should be OK
A noisy fan us caused by
1. dirt and dust built up
-Remedy carefully clean the fan blades ,case and cooling fins, with a soft brush and vacuum cleaner nozzle.
and 2 dry bearing.
Remedy -carefully peel back the foil label in the centre boss and in the recess place a drip if light oil[3in1 or sewing machine- do Not Use WD40
this is a drying agent- will make things worse.
Replace the label.
It is possubly best to do all this with the fan off the computer- usually 4 self tap screws into the coolin fins and a 2 pint plug.