Hi kharley.
The variety of seemingly unrelated problems happening suggests that there is one or more underlying hardware problems.
Bad (i.e., Marginal) or Underpowered Power Supply
Voltages on the vast majority of PCs can be observed easily with either of these 2 free utilities:
SpeedFan,
Everest Home 2.20
Allowable voltage ranges:
+3.3: 3.1V to 3.5v
+5: 4.7V to 5.3V
+12: 11.4V to 12.6V
Sometimes during heavy PC usage such as playing games with high powered video cards the PS can’t keep up with the demand and the voltages dip below acceptable levels. In this particular case a more powerful supply is needed. Often these video card manufacturers give specific guidelines about choosing a suitable supply. Even though an under-powered supply is not defective the cure is the same as if it were.
Overheating CPU
CPU and usually motherboard temps on the vast majority of PCs can be observed easily with either of these 2 free utilities:
SpeedFan,
Everest Home 2.20
The
CPU and motherboard temps should
always be below 50C.