|I'm not sure how the internal stuff on that is arranged. The PSU is the power supply. That should be easy to find. The cpu will be under the biggest heatsink.|
I think that's got on-board video. That means the video controller is on the motherboard and not an add-on card. However it's usually possible to add a video card.
But the problem is very unlikely due to the video controller. So it's not a good idea to be thinking about buying a video card until you know what the problem is to begin with.
The 'lack of memory' beeps indicate the PSU is probably good as they're coming from the bios but an indication is not a guarantee.
You might start by removing any add-on cards and disconnecting all the drives. Then try booting up. If you get a posting screen then the likely cause is one of the removed items.
Check that the cpu is in the socket OK ( I had someone once who set the cpu on the socket with no pins inserted and then put the heatsink on top) and the heatsink properly attached. Be careful around the cpu. It's easy to bend the pins.
Ideally you remove the heatsink and then flip up the ZIF lever to release the cpu. But sometimes when you remove the heatsink you'll pull out the cpu with it. That's usually OK. Just be careful of bending the pins.
There should be some paste between the cpu and heatsink. That's to facilitate heat transfer. Don't wipe it off but be careful not to get any on the cpu pins or in the socket holes.
The least expensive way to fix it may be to take it to a shop. You can start buying new stuff in the hopes you'll luck out and find the problem early on, but luck never works out that way. And be careful of spending more on it than it's worth:
Help me Jebus!