The power source is a 600W Pixxo Jaguar
That graphics card should work on that motherboard, try removing the graphics card and cleaning the connector with a rubber, before that go into the motherboard's bios and set everything to default or remove the battery for a few seconds and connect the graphics card if it's still the same it's possible that the graphics card has some defect, you would have to use the warranty if it's still valid.
In that computer you don't want to change the CPU or anything, if you don't want it for gaming the best thing is to hold on to it and later upgrade to a newer one, it's always better to buy by components and build your own.
You should also put the latest driver for the Chipset and check if there is any bios, although I see that in Intel it's more complicated to see which bios file to choose, on this page you can put the operating system and it tells you the drivers for your motherboard.