I have a Dell e7440, I haven’t booted it on in a while but when I try charging it, it turns on with the fan and everything for a second then shuts off. Powering it on the power led stays on for a few seconds then shuts off and all the other led lights stay on with the battery led flashing, minutes later they turn off. I tried leaving it to charge for the whole day and the same thing happens with the charger in and out of the laptop. I suspected something must have been wrong on the inside, I tried running the laptop without the cmos battery and still got the same thing I also tried taking out the ram sticks and hard drive and still got the same thing. Anyone have any suggestions on what I could try?