Samsung Laptop model Np300v5a-a03us

The most common cause of this issue is that it overheats. If it still has warranty I'd make use of that and have it replaced. If not, I suggest opening it up and cleaning out all the dust. Also make sure the fans all run smoothly, and that the heatsinks are all properly and firmly attached.

It's not due to heat, we already blew it out and it'll be off all night and when turn it on in the morning it still shuts offs.

Does it shut off if you boot into safe mode?

It shuts off in the bios and any time outside of windows

I'd follow up with what Rindi said.  Get yourself a laptop cooler and leave it running while the laptop is on.  This definitely sounds like an overheating issue.  I remember leaving a desktop fan running directly on my hardware to see if the device would turn off or not.  If it did, overheating is an issue.

Have you run a virus scan on it? may have an infection in memory.

Is this a recent development? if so did it come on slowly? or all at once?

We opened the laptop completely and checked the heat sinks as well as blowing the machine out. It has been off for three hours and then when turned back on it shuts down immediately before posting. Sometimes in some cases it will boot to windows which is how we updated the bios. What struck me as odd and that it may be related to the board in some way I am not aware of is that it was shutting down but when we booted to diagnostics it wouldn't recognize any usbs in the computer until we updated the bios. We've cleared the cmos, reset the bios, and checked everything that, like you suggested implies a heating issue and still coming up blank. When it shuts down no single part of the machine is hot in any way.

To top it off to make sure it wasn't anything external like the hard drive or the memory we switched them out with ours and did a base os install so it doesn't seem to relate to a virus in any way.

Any other suggestions would be helpful.

Cleaning out the dust alone doesn't ensure proper cooling. As I said earlier you also have to make sure the heatsink is properly attached and the fans run. CPU's and GPU's can heat up really fast, so you can get overheating already at post, and even if the PC has been turned off overnight.

Run virus scan

I can't see viruses as a viable option with a brand new factory HD and Memory installed, and unused. As to the previous we have a cooling pad underneath as well as currently having removed the heatsinks and applied more thermal paste with recurring results.

Thank you all for your input. I wanted to rule out all possibilities before informing the customer the computer or mainboard will need to be replaced.