apparently, the PSU caused some components to malfunction, so i went to the store and bought a few 2nd hand stuff:
-Replaced the i5 4460 with an i7 3770
-Replaced the Motherboard with an Intel DH77EB
-Added 8GB RAM
- Replaced the GT 710 with a GT 630 (because the 710 caused a weird problem where the PC won't get past the BIOS screen)
-Swapped out the PSU to another generic one, 350W.
all these cost me around 67$ because the guys at the store are really nice people