Dell XPS L501x won't boot, battery light keeps staying on.

Hello,

Yesterday I decided to renew the thermal past of my laptop. I already dismantled it before to clean the dust, so I already knew how to do it. So after I renewed the thermal paste, I tried to boot up the laptop. It was very strange, first the orange light turned on, the light that normally warns you that the battery is almost finished. And at the same time, the fan was blowing at full power. I put the battery in, and then I tried to boot again. This time the laptop hang at the BIOS screen, that one with the blue bar going from left to right. I dismantled the laptop again, because I taught I didn’t connect something properly. After I did this, the situation became worst; the laptop won’t even turn on. And as a bonus, the laptop is thinking that there is a battery inside the laptop so it’s showing the battery charging light. Because a video shows more than a thousand words, I made one that you can see here: . I don't think it's relevant, but I have a Intel i3 370m and a GT420m (Nvidia).

All tips and advices are welcome,

Thanks in advance,

Aswin