Alienware aurora r4 wont start windows, endless boot cycle

I'm going t give the situation leading up to this problem in casemit helps.

My computer began to slow down tremendously, the computer crashed quite often in 2 different ways 1 the computer would crash with a windows message saying my computer ran into problems the second way it would be a black screen saying no internal hard drive found, also if I were to leave my computer on for a while it would end up in the 2nd type of crash or when I tried to return and give signal so pc could return it wouldn't.

After a few days when I started the pc windows started normally but it was extremely slow nothing loaded fast a process that was normally a few minutes became hours.

I then launched into safe mode to reset my computer bug every time said it could not finish.

Now when I turn on my pc I get the alienware boot repeating infinetly, it will beep power up then a bit later my peripherals will power down as well as the lights on the pc and it will start again.

I can't access the boot menu when presiding f12,