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Sir you adviced to check your serial cable or Sata cables if you are getting any where near Booting the windows However there could be the problem with powersupply but is very rear. If you are using Serial cables than you should replace them both of harddrive and CD/DVD Rom. the same problem I have faced When I had Pentium 4 but I already knew what could be the problem and it was of serial cables.
There is a short somewhere, either with your motherboard or your powersupply. Test your powersupply to another motherboard that has the 4pin 12volt adapter if you have one. Most likely your motherboard is trying to prevent circuit overload to the cpu.
I don't think we should directly blame it to the Power Supply, but I can't make it very thorough since you didn't mention whether the system can boot up or not even without display or not. Can you hear beeps or fans' sound when you press the Power button on the computer? Have you tried the monitor on another computer? or have you tried another monitor on your computer? or have you check the video cable? Have you checked the Ram? Have you checked the power supply unit (smps)? Have you checked the Power cables? and many more. If you haven't done all these, do one by one and replace the necessary components respectively and keep trying, if nothing's worthy, then it must be the video card on the motherboard which I would recommend installing a new video card (add-on graphics card). It's also possible that there's problem with the Motherboard bios.
In most cases, the Ram is the cause, once you replaced or checked Ram, you'll be able to find out what exactly is the root of the problem.
These are the basic steps of troubleshooting a display problem.
hey try to unplug the power cord from the powersupply now open the case and unplug the powersupply to the the motherboard and then press the reset button on the front for 15 seconds and than connect the motherboard powercable and plug in the powercord back in to the powersupply and try to restart the computer. please tell me if this works and ANY thing that happnes ok best regards mike
ya definetely....i will help u out in solving the problem.
first of all open the side cover of the cabinet.....here i am first instructing you how to check the power supply in the system..
as soon as you open the side cover of the cabinet the remove all the wires coming to the motherboard from the powersupply.then there u can see a 20 pin connector coming to the motherboard from the powersupply.in that bunch of 20 wires shot the green colour wire and the black colour wire...and give the power to the powersupply. if its ok and the fan of the powersupply is working then the smps is ok other wise u need to get it repaired by giving it for chiplevel servicing.....
if powersupply is ok then check whether there are any burns on motherboard if so and even if not u need to give the motherboard for chiplevel servicing.....