Cant boot up old computer

[miytko]

Hello everyone!
So, recently I decided to boot up my old computer (Windows Vista),
It hasnt been booted up for like, approximately 5 years.
So I tried a couple of times and searched for a solution but It didnt work.
When I turn the computer on, the monitor automatically turns on, but it says No Signal.
The fan starts moving and two icons on the pc turn on, a green key similar to the one when you want to shut down the computer, and a red cylinder.
I tried connecting a mouse and a keyboard, but it didnt work.
I cant tell much more than that if its working. So, here I am to ask, what should I do? How can I get it to work again?
Thanks!

 

[190221]

Sounds like it died. Can you open it up and see if anything is obviously wrong? examples: bloated/ exploded capacitors, metal things where they shouldn't be, excessive dust, rust, smoke residue...etc.

 

[jr9]

I'd start by making sure all your connections are good. Your display will not work if it isn't connected to the PC properly.

Does the PC continue running or does it shut off by itself?

Does it beep at all a while after you start it?

Did it work before you stopped using it?