Acer Aspire One not turning on after overheat.

Hello.
My laptop is completely off. It overheated I presume over night when I left it on.
All of the lights are out, and the laptop will not turn back on. The charger is completely working, as I tried it on my sisters laptop before and it charged. What is wrong? I really need help and I’m not looking to spend any money fixing it.
Thanks.