Compaq Presario cq50, power.

A while ago, I had a problem with my laptop, caused by several updates. Suddenly, it stopped working, (battery was ruined), and I thought the power cord was the problem. So I bought a new one (according to the specifications of the previous one). And effectively, it worked. Nevertheless, after a few minutes, it shut down, and the light located next to the power cord entrance was blinking. I tried to turn it on again, but it was no use. The next day, I turned it on again, worked, and after a while shut down.
I opened it, the fan was relatively clean, and everything looked normal. 
What do I do?
I could work without the battery before, so I do not think that's the problem.

Hi @FermiEffect ,
Thank you for visiting the HP Support Forums and Welcome. I have looked into your issue about your Compaq Presario 50 and issues with your AC adapter. What are the specs of the adapter you installed?
Yours is 65-W  AC adapter and should not be a travel adapter.
Plug the power adapter directly into a functioning wall outlet. Do not plug it into a power strip, surge protector, or secondary power source as this could cause and issue.
Here is a link to troubleshoot the Ac adapter.
Hope this helps.
Thanks.
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