Can I get some tips

I have run into some bad luck with computers lately, 3 broken motherboards, 2 RAM chips, 1 GPU. Can I have some tips to avoid this? especially since i am getting a computer worth a couple thousand $$ in a month or two, and I don't want that breaking within a couple months.
Here is the thing I rebuilt for the third time yesterday.
Intel Core Duo, 2GB RAM, NVidia G210, 400 Watt PSU, 500GB Seagate Disk Drive, Motherboard from an old IBM Thinkcentre The start button and front panel don't work, But it actually runs, so that's something

Here is the thing I rebuilt for the third time yesterday.
Intel Core Duo, 2GB RAM, NVidia G210, 400 Watt PSU, 500GB Seagate Disk Drive, Motherboard from an old IBM Thinkcentre The start button and front panel don't work, But it actually runs, so that's something
