I have an HP dv7 1130us laptop that recently quit working. One day it worked, and when I went to turn it on the next day it gave me a black screen and the light by the caps lock button blinked every few seconds. Looking on the hp support page for my computer I found that the blink code meant that the CPU had a problem (see here). I tried taking the CPU out and plugging it back in. Then I bought a CPU from ebay (it is brand new) and put it in. Same problem.
When I turn it on the fan comes on strongly then cuts to a lower rpm abruptly. No light comes from the screen. As I said the caps lock and num lock lights flash once every 2 or 3 seconds. The light by the power plug stays on solid. I am not sure how it could matter but I should also mention that we got a new wifi router the day before this happened. There is other helpfull information here.
Do you have any ideas about what might be the problem?