Sony Vaio startup


Beta member
Hi to everybody. I'm new to this forum. It's a great forum. I have a problem with my Sony Vaio PCG FX340 laptop. I have Windows XP on my computer. I did not upgrade the computer recently(only the sp2 package).The computer it begin having startup problems. Some times does not want to start. It starts up, but it's showing a black screen and nothing else happends(no hard drive activity-I replaced it and still nothing). After a couple startups it starts and it's working fine. What you think it could be the motherboard or some software problem?