My first PC is powered by a sandybridge i3-2100. I use it for casual internet browsing and web development but recently I'm experiencing so much lag and not responding messages. I can't troubleshoot the issue as i dont have any spare parts to swap on. Here is the PC specs: Intel i3-2100 Intel DH61SA Zion 2GB DDR3 RAM Odesey 450W PSU Seagate Barracuda 500GB HDD Whenever i check the task manager it shows that hard drive usage is 80-100 even if i have no applications running. When i scrolled down i noticed that a system service was using this but i was normal before. So tried reinstalling Windows, switched to Windows 8.1 anf even tried linux still its same. What i think is that the PSU might not able to provide enough power as it is a less popular brand and a cheap one. What do you think about this? What can i do to use this for web browsing again?