Ok, so here is how to go about this based on your circumstance.
Since you do not have the means(substitutes) or knowledge to diagnose the issue, take it to a PC store nearby. Let them figure it out for you. If its a minor issue, you can get it fixed promptly. If your GPU is a relatively newer one see of it can be salvaged, since GPU prices are crazy right now. If its the same one that came along with the machine, then never mind. I believe the 2 x 2TB drives will come from the old rig.
Now, coming to your new PC. ROBLOX is a very old game and has a very modest hardware requirement as per todays standard...
System hardware requirements
- Graphics Card: On PC/Windows, the Roblox application requires DirectX 10 or higher feature level support. For the best performance we recommend either a computer less than 5 years old with a dedicated video card, or a laptop less than 3 years old with an integrated video card.
- Processor: Roblox recommends you have a recent processor (2005+) with a clock speed of 1.6 Ghz or better. There have been some issues with older AMD processors.
- RAM or Memory: Roblox recommends you have at least 1 GB of memory on Windows 7, Windows 8, or Windows 10
- Storage Space: Roblox recommends you have at least 20 Mb of system storage space to install Roblox.
- Mobile: Click here for system requirements for Roblox Mobile.
https://en.help.roblox.com/hc/en-us...mputer-Hardware-Operating-System-Requirements
The 5600G integrated VEGA 7 iGPU is one of the best in the current market and can easily run ROBLOX without a dedicated card. It also comes with a decent stock cooler that you can use for now...
View: https://www.youtube.com/watch?v=amEILkG0HCI
If the GPU in the dead PC is good enough you can add it to this, else the iGPU is god enough for modest gaming...
PCPartPicker Part List
Type|Item|Price
:----|:----|:----
CPU |
AMD Ryzen 5 5600G 3.9 GHz 6-Core Processor | $358.77 @ JW Computers
Motherboard |
MSI B550-A PRO ATX AM4 Motherboard | $148.77 @ JW Computers
Memory |
Team T-FORCE VULCAN Z 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory | $79.00 @ PC Byte
Storage |
Crucial P2 250 GB M.2-2280 NVME Solid State Drive | $49.00 @ Amazon Australia
Case |
Deepcool TESSERACT BF ATX Mid Tower Case | $49.00 @ PLE Computers
Power Supply |
Corsair CXM 550 W 80+ Bronze Certified Semi-modular ATX Power Supply | $95.00 @ Scorptec
|
Prices include shipping, taxes, rebates, and discounts |
|
Total |
$779.54
| Generated by
PCPartPicker 2021-12-31 13:10 AEDT+1100 |
I would refrain from going with a prebuild as they usually cut costs with very low quality parts to get max profit. PC building is real easy if you just follow guides and tutorials, but if you are not confident, you can just pay a technician or store to assemble it for you for a modest fee. You will still end up with good quality parts for the build to last longer.