Notebook Boot and Lockup

Hello, I have a problem with my laptop hp compaq 615. It was working fine and suddenly when i wanted to turn it on i get a black screen. It starts fine i hear a cooler, then stops and nothing on display shows. I was looking accross the web for my solution and didn't find any so am posting here. There are only 2 lights one for power button and one for wireless/bluetooth button. W/B button is blinking all the time orange to blue. Capslock button isn't blinking which I found out that it shows light codes if something went wrong with memory, proc, hard etc. I removed a memory to check if maybe the light isn't working on capslock. After i started the laptop without memory i get same black screen, capslock is blinking 3 times in a row that indicates that something is wrong with the memory, but W/B button isn't blinking in that situtation. I put the memory back and i get same result, blinking W/B button and black screen. If I may add the feeling that i get when starting up the laptop is it stops starting up when W/B button starts to blink.

So I think if W/B button is blinking, maybe wireless card has gone wrong and needs changing??? But its silly that laptop won't start because of that.....

Detailed info on laptop: Compaq 615,

                                             Serial: [Personal Information Removed]

                                             Product: VC289EA#BED

                                             Warranty: 1y1y0y

                                             Model: CPQ615URM - 76Q5X320MBNNCN22F-a

                                             Model number: D40