U check whether power supply coming from the terminal or not.. if its coming then u check whether SMPS fan rotating or not.. If its not rotating means u have to change ur SMPS unit.. If that also rotating means u wont do anything.. Because next steps are complicated and risky.. Check whether the system under warranty or not.. If its warranty means u ask help from the warranty providers..
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Take everything out of it that you can. That would mean the ram and drives, see if it boots. IF it does, then put the ram back and check it again. If it does put the hard drive back etc. If you get to the point that it wont boot with nothing installed then it could be a dead cmos battery or a loose CPU or something like that or a bad mother board.
Request you to try following the below steps which might help:
(1)Turn off the computer.
(2)Remove all the external peripherals like AC Adaptor, flash drives, battery, etc.
(3)Press and hold the power button for 30 sec which releases the static on the computer (if any)
(4)Put back the battery and plug in the AC Adaptor.
(5)Let the computer charge for some time.
(6)Try turning on the computer.
If the computer doesn't turn on then check if the computer gives any series of beeps or if there are any diagnostics LEDs shown on it.
Try resetting the Bios. Remove the ram chips and if you can get access to it, the button battery on the motherboard. Wait a few minutes then put it all back in and boot up. If that won't work, try the steps at the link below, or try them first if you prefer.
The problem maybe the RAM, it is faulty or just needs reseating to make proper electrical contact. Reseat the RAM and then boot up your laptop. If it still does not boot up then remove the RAM module/s and take them to your friendly computer repair shop and get them to test the RAM for you. Just like you sometimes need a mechanic to repair your car, sometimes you do need a technician to diagnose and identify the fault or faults on your computer. Not only does a good service technican have the experience to deal with this type of problem, they also have the equipment that allows them to look at things the average computer user can't see, and he has a collection of replacement parts that can be used to quickly test individual components on your computer.
Try taking out battery and plug in power. If it works, battery is faulty. If not, Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not, Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.
Note: If machine is under warranty no need to pay for the repairs.