My Dell Precision M50, on light flashes 4times,no post, nothing just goes out.
any help :-|.

kiyo.

When we get anything like this on telephone support, we book out a motherboard and power supply as standard to start with. Depending on the machine, sometimes other components can also be affected (blown keyboard, etc) but you only find this out later.

There's not much else you can do. It's likely to be either the PSU, the MOBO, or both.