hi, really hope someone can help me.Came home last night. My PC is nearly always on, but it had turned itself off when i got home.It now wont start.When i try to power up, the power light comes on for a second and the fans start to move, but after about 3 seconds, it shuts off. Whilst experimenting, ive realised that if press the restart button and the power button at the same time, then the light and the fans stay on, but the monitor still says ''no pc input'' and nothing actually happens.I've tried with a different monitor and its the same.i use XP home edition.PC is about 3 years old.not sure what to do. I've also given it a clean inside this morning, as in the past, that has helped when i've had issues with itcheers