First remove any power cables and batteries(if laptop) from your system and hold down the power button for 15 seconds.
Plug the power cable back in & attempt to boot.
If this does not solve your problem then you will need to remove all non-essentials from your system.
If laptop, this simply consist of battery, ram, optical drive & any other removable bays or devices. Unplug all cables except the power cable & attempt to boot.
If desktop, you will need to remove any cables plugged into your computer except keyboard, mouse, power, video, sound, & network cable. Open the case & remove any PCI cards, except video cards, unless you have on-board video, unplug the data & power cables going to the optical & hard drives. Now attempt to boot. If you have no luck you can remove your RAM sticks & try again. If you get an error beep warning you about no ram then you might have a bad ram stick. If none of the above works then you may have a bad power supply or motherboard. Power supplies are pretty easy to test with tester or use a spare.
SOURCE: Won't turn on - power led comes yellow & blinking
Please perform the steps mention:
Disconnect the Power cable / A/c adapter/Battery from computer.
Disconnect External peripherials.
Hold down the power button on the computer for 10 seconds.
Reconnect the power cable or A/c adapter and battery or the computer
Try to turn on the computer
check for Led's on the computer
If still no display ,shut down the computer,disconnect power cable.
Open the computer tower,remove memory modules,reconnect power cable and turn on the computer.If you get a beeping sound after turning on you should be getting beeping sound suggesting the mother board is not bad.Turn on the computer and disconnect power cable from computer.
Reseat 1 memory at a time if you have 2 memory module or if single memory module reseat in different memory slot,swap memory module.
Reconnect the power cable and turn on the computer if it boots to desktop possible issue with 1 of the memory module.
Disconnect the harddrive ide cable from the harddrive .Turn on the computer.
If still unable to power on .Shutdown the computer and disconnect power cable.Remove video card,sound card ,modem card if any .Connect just the vga cable from monitor to the integrated video port.
Connect power cable and turn on the computer.
If computer turns on possible issue with one of PCI or PCI express card.
If still unable to power on.Disconnect the power connector pin from the motherboard and reconnect it back.Turn on the computer check power power led on motherboard,also check if the processor fan is spinning. if no go then issue with motherboard. Good Luck.!!
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