|The video chipset name is shown in several places.|
One place is in Device Manager.
RIGHT click on My Computer - Properties - Hardware - Device Manager
Double click on Display adapters.
What does it say there ?
I'm assuming you have a tower case.
The power supply capacity is shown on a label on the power supply inside the computer case - max xxx watts (output).
Remove the left side panel of the computer case as seen when you're facing the front of the computer. Usually there are two or three screws at the back on that side you unscrew, then the side panel can be slid to the rear to un-latch it.
The power supply box is at the top of the case at the back.
Copy down the brand and the max watts. Tell us what that is.
There should be air being exhausted from the back of the case from the power supply's fan when the computer is running.
If you have a video card in a slot, that's what the monitor video cable connects to, lower down on the back of the case. If you don't, the monitor video cable is plugged into a port high up on the case near the top.
While you're in there, if the cpu fan/heatsink has mung (dust, lint, etc.) on it, clean it off, but DO NOT use a vaccuum cleaner to do that (they produce a tremendous amount of static electricity when running, and anything connected to them can discharge that to your components) - use canned air, or an air nozzle if you have access to an air compressor, or an artist's brush that can be used in small spaces, etc. It may be difficult to clean the top of the heatsink under the cpu fan - the most likely place to have mung on it - and the bottom side of the cpu fan blades unless you remove the fan. If you have a case fan, clean that too if it needs it.
Also check for mung on the video card fan and heatsink if it has that, and the power supply's openings / fan.
With the cover still off, start the computer and make sure the cpu fan spins - if it doesn't spin, if you're sure the power supply is working okay, don't use the computer until you have replaced it.
If it spins too slowly, and/or if it makes rattling or screeching noises, most likely to be noticed when the computer has cooled to room temp, has not been used for a while, and then is started up, the cpu fan's bearings are failing - the cpu is likely to overheat as a result of that if it can no longer spin it's full speed - replace it as soon as you can.