Power supply

Hello, i


i have an aspire 5100, it was working fine and used it for almost 2 years and all of sudden when i switch on, as I wait for it to boot for a minute or so, I notice that there is no power, the battery is fully charge and the ac adaptort is also plug in to the wall socket and connected to my laptop. after trying for several time same result, is it the power supply?, the internal fan
is working..



y