Signs I Need A New Hardrive?

Question

Okay I was wondering if any of these signs mean my harddrive on my computer is failing.

1.It can be fairly noisey.
2.Constant Crashes.
3.Its v.slow to load programmes.
4. Everytime we switch users,a black screen appears saying in hite writing CANNOT DISPLAY THIS VIDEO MODE.
5.Have had the Blue Screen Of Death about 10 times in the past couple of days.

There is 3/4 of the computers memory left so it cant be that im using too much memory.
Is It time For A New Hard Drive?

Someome Get Back To Me A.S.A.P?
Thanks.

Sophie x