Laptop powers on then shuts down

Super Computing · September 14, 2019

I own a very old machine, the HP compaq nx9010. It has 512mb dual channel memory. I power it on, the lights all over the laptop come on for a second, then it immediately powers off. When it isn't powered on, the orange power light is always on, so I guess that means that the machine is getting power and that the charger isn't the issue, I cleaned out the laptop, reapplied thermal paste, but it didn't help. The display also doesn't come on during that 1 second of on time. I also switched out the ram with ram from a working machine but it didn't work. I do know that the battery no longer works however when plugged in, it should turn on regardless. I saw some websites suggesting to reset the cmos or something like that, I'm not too sure, and I wouldn't like to re-open the machine and do that only to be brought with that same issue. I didn't pay for the laptop, it was given to me a long time ago, so anything to get it working would be great, since it's broken, what worse could I do anyway. Any suggestions?

Edit: I left it on charge overnight and the following morning, the light that was orange has now turned green, but it still refuses to stay on instantly turning off after 1 second.