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Test your PSU or replace it if your power supply units fan
is not working your PSU is faulty
One bad lead can cause a computer to continue on a cycle or
to shutdown or fail to detect/ boot up a computer hard drive
Test all leads that attach to your hard drive including
the leads from your"((motherboard to your hard drive))"make sure they have a secure connection and
are not faulty or just replace them they could be faulty make sure all leads that
are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections
and are not faulty even the electrical extensions or just replace them they could
be faulty a computer
needs its connections to continue its cycle and have an end so any faulty leads
will end up with a computer errorhope this helps
This could be a power supply fault,check the volts on the red,yellow and earth lead(black)THE RED LEAD =5VOLTS
Diconnect the pc mains plug from the computer.
Disconnect the power supply leads from the motherboard,and switch on and check the volts on all leads of all those I mentioned.If these are present when they are not connected to the main board,then the problem is with the motherborad,most likely the bios chip is faulty.This chip kicks starts the PC into coming on.Failing this send the PC back to where you bought it and let them fix it.
IT COULD ALSO BE THE MAIN ON OFF SWITCH AND THE CABLE ITSELF FAILING.CHECK THIS WITH AN OHM METER ON X1 OF THE RESISTANCE SCALE.DISCONNECT THE MAINS PLUG FIRST.
you could try removing power lead then remove battery from m/b for 5 mins this will reset bios back to maufacturers settings then replace battery and power then try boot up if no luck then change motherboard
If you have *********** board manual still then try and clear the CMOS memory,
turn the computer off
remove the power lead from the back
take the side off
remove the cmos battery
move the cmos jumper from pins 1 and 2 to pin 2 and 3 and the back to pins 1 and 2
replace the battery
put the side on
replug in the power lead
boot the computer
if that doesn't work then try to fix the bios. here are instructions for that: http://support.intel.com/support/motherboards/desktop/sb/CS-023360.htm
and here is a link to the .bio file for you: http://downloadcenter.intel.com/download.aspx?url=/10140/eng/EV0482P.BIO&DwnldId=10140&ProductID=1673&lang=eng
You can download the manual for your motherboard here.
Inside you will find information of where does each connector go. Each connector on the case has a marking on it (HDD, PWR, RST or similar) which stands for hard disk LED, power button, reset button and so on. Connect it to the right place, and problem is solved.
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Do you have a video card installed or are you using the built-in video? If yes, check the video card if it is installed in the motherboard firmly, first unplug the power cord in the power supply then try removing the card then install it again in the agp slot carefully pushing it firmly, then put the power cord back to the power supply and try to power it on. Does it have a display now?
If the video is still blank try reinstalling the memory module in the motherboard, first turn the pc off then unplug the power cord, next remove the memory modules from the motherboard by simultaneously pushing locks on each side of the memory, then use a clean paint brush to remove any dust on the memory modules copper contacts and also clean the memory slots in the motherboard, then install the memory back to the slot making sure to match the notch near the middle of the memory to the memory slot in the motherboard, and also make sure that the locks on each side is firm. Then connect the power cord to the power supply then turn it on. Does it have a display now?
In the condition where your using the built in video and a known working memory and still there is no display, the motherboard could be defective already.
In this case it is normally a voltage regulator near the cpu that is shorted and will need to be replaced.
Remove everything from the board, except the heat sink fan and plug in the big power connector, do not connect the 4 pin connector. Turn the power on as you were before.
Using a multimeter, check the voltages on those regulators. You should find them running in pairs normally, but make sure to check all of them and try to pick the odd one out.
Put your black lead to ground, and use some electrical tape to cover all of the red leads probe except for 2mm at the tip to help prevent shorting out anything else while you are there.
If I understand you right, your display is not coming on with your new hardware. Try the eliminaion process:
take out the new things. Install them one by one, and try booting each time you install one. If that passes, turn off and install the next one, until you isolate the one failing. Once you know it, installit properly or come back here for help.