My HP laptop wont charge the battery

[Alex]

I have checked all connections and have booted both in Win7 and In LL but the problem remains. The laptop does not see the power connection and thinks it's not connected. I have switched power cords but no use.

I went online and in trying the many suggestions ( none worked) the battery went flat and now the laptop does not switch on at all. I plugged the power cord in and the orange light flashe a couple of times but does not stay on. I left it overnight but it did not charge ( it was a desperate hope )

Any ideas?

Thanks