if it doesn't even post then, well....yeah
i'm assuming that you can boot up and stuff, so really the biggest thing is stability. I found my computer to be a total pos but with a 250 to 300 watt ps upgrade, I was flying high. I get the normal lock ups once in a while, but really not that often at all. I run my computer like 23 hrs a day too, so it's a huge difference to me