No Start Up - Dell Inspiron 530

Hi,

My Dell won't start up at all. There appears to be power, but when I press the "on" button, nothing much happens. I have checked all connections inside, and all seems fine.

I have done a small YouTube video to show the problem, which might make more sense.

Dell Inspiron 530 won't start up. Please help. - YouTube

Any help would be appreciated.

Thanks