hard drive activity

I have an issue where every time I modeling or rendering in my decent computer, it just suddenly lags and start freezing. Even HDD LED not flashing at all. It also happens for the second for no reason. it's either due to my specs are not very high. It was running Blender. Computer: Dell...

So last night my PC worked just fine, played some games and then decided to go to bed. In the morning my PC refused to turn on, no fans no lights nothing.. Other than the red light on my pc case that is.. Please help me indicate what this means and possibly how to fix the problem. Thanks...

i wanted to buy a new processor but i have not thought between i5 or i7