Is my computer on it's last legs

Guys - it looks like I need a bit of advice and guidance. My computer is a Dell 8300, about 7 or 8 years old so I guess it could need replacing. Is there a way to test it? I've been here before and had great help so I'm hoping for rescue again. I think there was a web site I could access which tested my PC and you guys gave me advice from reports created. I can't find my old posts so not sure what that was. Can anyone help? The issue right now is that I race online, today I lost all sound. Then I got vision distortions with yellow and blue vertical line and finally my computer froze. I had help recently because I thought my computer was over heating but now I think I have a serious, machine ending problem. Rebooting, it works ok, for now. Can anyone help me please?

7 or 8 years is a good life for most computers. I recommend you backup any data you don't want to lose now. Your problems could be heat related so make sure the interior is free of heat trapping dust and that all fans are spinning. Beyond that, I always want to ensure I have a good power supply by swapping in a known good one.

Hi again Digerati Yes I have online back up so I'm good there. Checking the case again I have 3 fans, video card, power source and a big one pulling air over the heat sink. All are functioning.

Then, again, I would look at the PSU first. But frankly, I would be looking at something new.