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Not sure just what you mean. If your computer is plugged into the wall and the power is turned on, the power supply should be on and the cooling fan turning. Also, the CPU fan should be turning and the hard drive should spin up. Note that the power supply is the main component that must be supplying the power. If you don't hear or see the fan turning in the power supply and the little power light on the front of the computer does not light, replace the power supply. If your power supply is running and nothing else is running, I would unhook all devices and leave just the CPU and video and memory in. If you get nothing, then the motherboard is probably bad.
as i always say: intercept
all of cables of your PC case and even power cable of your monitor. evolve
battery of bios then wait for 25 minutes then connect all of cables and
try turning on your PC: 1- with battery of bios 2- without
battery of bios it should work.(this works cause the
motherboard reset it's bios and start correctly again).
when you say not coming up meaning not turning on?
>If its not turning on and no lights even on power button but monitor is powered up try swapping power cable of monitor to your tower to check if its just power cable issue
> if still not turning on and no lights at all then you have problem on power supply
> please advise me if the computer gets light because youre problem might be caused by a different thing if the system is turning on but its not booting to windows so please provide complete details of the problem
if you still have old video card remove the new one and replace with old one
change setting back in bios
then reinstall new card and instead of changing through bios just start computer it should automatically change settings for you
please let me know
if your system is not posting....try these steps... 1.do a complete power cycle(remove all peripherals & disconnect power cable & then press n hold the power buttoon for about 20-25 seconds).then try turning on the system?...if no then, 2.open the cpu & remove memory cards...then try turning on the system?...if no then, 3.remove all hdd data & power cables....then try turning on the system?...if no then, 4.remove all pci,agp cards,if any......then try turning on the system?...if no then, 5.check if the processor power connector is connected on the motherboard correctly or not....then try turning on the system?...if no then, 6.motherboard and the power supply are the culprets & you need to replace these 2 devices.
if this fix the problem,please rate my solution...i will be glad....
THE MAIN SWITCH FROM THE PANEL ON THE FRONT OF YOUR COMPUTER DIDNT MATCH YOUR NEW MOTHERBOARD CONFIGURATION
START BY REMOVING ALL WIRES AND CONNECTORS EXCEPT POWER ONE, SEE IF SYSTEMS TURNS ON, THE POWER SWITCH MAYBE THE PROBLEM, RESET SWITCH, ANY EXTRA CARD YOU PLUG INTO YOU MOTHER BOARD
*********REMOVE ANYADD ON CARD ANY ADAPTER DEVICE ALSO,
ADD ONE WIRE AT A TIME UNTIL ALL WIRES ARE CONNECTED
what kind of computer is it? how old is it? have you added, removed or changed hardware recently? have there been any power spikes, outages or surges lately while the computer was running? lastly are the voltage settings 120V/240V on the power supply set correctly? it sounds like the power supply is dead from what i've read but i can't be sure because there are many reasons this could be happening, i.e. the processor gets too hot while the system is trying to start and the computer shuts down to prevent damage to it, also have you tried plugin the system into another wall outlet or socket on your power strip? if no hardware has been add, removed or changed. you can start with a power supply but if after that it still won't power up there's a deeper cause to look for!