When AC is plugged in, the power light will not light up if the battery is not plugged in. The battery itself is a known problem also and after 3 years it now fails to hold a charge. When plugged in power is sporadic often not lasting long enough to finish the boot up.
This sounds like a power cord or connector problem.
these cords offten break at the back of the connector to the lap top. When you hold it just right it will work. Otherwise it acts up.
If the battery were in good shap it would smooth out the issue but....
Replacment power cord/transfomers are reasonable on e-bay many come out of china and are inexpensive. also consider an all in one type that will be upgradeable for your nest notebook and work in the car or airplane as well as the house. I like Igo brand and Targus but they are a personal preferance.
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If the the ram is the problem of your system, there should be a power on light on the system. indicating that some of the component of the system is not working correctly. But since you mentioned there is no light, it is the possibility that the problem is the motherboard itself.
This could be a problem with the battery, try removing the battery and starting on the adapter only. If this doesn't work, then I'm afraid it is going to be a motherboard problem, most likely with the power management system, this is the most common area with this type of problem. You can take it in for diagnostics, but I'm afraid you're going to end up having to replace the motherboard in order to fix the problem.
Batteries can develop a dead short and cause a no start. Try starting without the battery. Other things you can try is checking the power supply with an ohm meter,or plug it in and stick it in your mouth, but me personally, I'd use the ohm meter. Also check the memory, a faulty memory chip can cause this. If none of these work, them I'm afraid the problem may be with the power management chip on the motherboard. If the pm chip is malfunctioning, then motherboard replacement is your only option.
I recommend bringing this laptop into Best Buy for repair. This has several hardware related issues from what you've described. If the repair quote is any more then $200 (which i anticipate it will be) I would consider investing in a new laptop and not throw good money after bad.
Check the ac adapter. It seems your adapter is not charging it. Either the ac adapter or your dc port may be the problem. Is this the correct adapter, is it giving the correct voltage. These should be considered also.