Hey everyone on this thread! I have an issue with my computer that I need fixed ASAP.

Basically, the computer has graphical glitches and extremely slow performance, and will eventually completely freeze (except mouse pointer). The computer, prior to a few days ago from when this first started, never did this. It was extremely smooth and buttery. The computer wil lfreeze when an intensive task such as YouTube in Chrome or Terminal is taking place.

I accidentally knocked the computer over, and it landed on its side. Ever since then, this has been occurring. I have opened the computer and ensured that everything is plugged in and nothing has been damaged, and all was fine. (As far as I can see)

(Yes, I understand, this was pointless): I also tried installing official Nvidia drivers but that broke the operating system (Ubuntu). I thought that maybe Ubuntu was the issue, so I installed a different Linux distribution called Deepin, which did not solve the issue. Now I'm completely stuck, and I need help.

Specs:
Graphics Card: NVIDIA® GeForce® 7050
Model: Acer Aspire M1800 (Desktop)
RAM: 4GB
Processor: Intel Pentium 2.70Ghz (E5400)

Any help would be appreciated.

Sounds like a hardware fault. Have you unseated a chip or cracked something? Examine it.

Sorry, but what you've posted/done makes little sense. You said everything was working absolutely fine with Ubuntu...until you physically damaged the system by knocking it over. So what on earth would make you think that a different OS would help with what is a hardware issue?? The chain of troubleshooting did nothing to indicate it was anything software/OS related. To break it down:

• Your system was working fine with Ubuntu
• You knocked it over and physically damaged it (the fact you mention this would indicate it was a fairly good hit)
• You then started having problems

Had you said "I started an upgrade/system was updating/tried new drivers, THEN knocked the system over..." would have some merit. Chances are your system is damaged, and no OS is going to fix it. I'm with business_kid here: check all your chips/memory/everything-that-could-have-been-knocked-loose. Reseat it ALL..unplug the cards, wires, etc., and plug it all back in after doing a physical examination on it.

Mhm, jeez. I thought it was a hardware issue, but it takes like 10 minutes to install a new OS so why wouldn't I try it? But thanks anyways.

From the looks of things, I haven't. I have a thought that it may be a GPU overheating issue. I just need to find a way to monitor the GPU's temperatures.

Because its a total waste of time. If the OS/software/drivers were all working totally fine, and nothing changed, then your hardware gets damaged/bumped around and it STOPS working, there is zero to point to anything with software. It's a hardware issue. It's your time to waste, but it's totally pointless. Would be like washing your car because it wouldn't start.
...from a flaky damaged system?? You haven't said whether this is a desktop or laptop, but have you turned it on while open to see if ALL the fans are working, if you suspect overheating? And how long does it take to start showing signs of bad performance? If it happens right away...not overheating, since it doesn't have time to get hot enough. Back to "something is cracked/damaged".

Again, as suggested, unplug EVERYTHING in your system, check it very carefully, and plug things back in. Memory, wifi, video, everything. Try removing devices one at a time and check the results. Borrow another video card and try it, if you can. But this is a hardware issue, and until you identify the bad/broken components, it's pointless to install new OS, GPU temp monitors, etc.

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Trying a LiveCD/USB to rule out hard disk issues would have made more sense, but anyway...

Based on the symptoms, if the BIOS is set to shutdown at a critical CPU temp (which it should be), I would suspect the heatsink on the GPU/MCP chip. It could easily have jarred loose. Even if the heatsink doesn't feel loose the thermal material could have cracked. And it's possible your mobo could have a small fan cooler on the mobo chipset since those nforce chips ran extremely hot, so if that's the case, make sure the fan is running.

This is a desktop system, and opening it to see if the fans are all working whilst the computer is on is my next task (I'm not next to the computer currently). Bad graphics performance occurs right after I log in, and the computer will completely freeze when a heavy task is in operation (Chrome or Terminal) I will try to unplug and replug everything to see if that affects anything.

I understand the OS reinstallation was completely pointless, but that's past so I won't focus on that anymore.

I will try to reinsert all the connections that TB0ne suggested, and also check to see if all fans are working and connected.

Yes, and if it's still doing it, I would reseat the mobo heatsink. Use good thermal material (not cheap stuff) because like I said, those nforce chips run hot.