Noisy camera When I turn the camera on it makes a clicking noise,then an hour glass shows in the view lens shortly after that the message says system error.Whats going on here?

Hi,
I guess you will have either given up by now or got the camera repaired by Nikon or so. But in case somebody else has the same problem (like I had), here's my solution.
Same as wilding2004 and ruggb described, it is a problem with the motor can't adjust the zoom of the lens because it is blocked.
To remove this problem, it is likely that you will have to open the left part of the camera body where the lens is located. So if you don't feel confident in that, send it in - but this will cost at least $50 - $300, which is a lot taking into account the age of the camera and the price you'll pay for the same model e.g. on eBay.
To open the body, you have to unscrew many very small PH screws (I used a PH 0 x 60 screw driver) and some of them are not easy to find: - There are six screws on the left body facing towards the right part of the body which contains the monitor, buttons, battery and so on. You can only see and unscrew them when the camera is tilted by +-90°. - There is one screw at the front holding the cover for the protective glass of the lens and viewfinder. Probably you won't have to remove it, but I did and it didn't do great harm :-) - There are two screws hidden below the Coolpix label made of plastic on the left. This is glued onto the body, so there is no other way to remove it than pulling it off, probably using some small screwdriver to loosen it in the beginning.
After removing all these screws, you'll be able to separate the upper and lower cover of the left half of the body. Then you will have to further remove interior parts or at least loosen them enough to free the zoom again. 
A little bit of a warning: Since this camera, like any other compact camera has a built-in flash, there is a capacitor on the left side of the camera to supply it with power. And even if you have powered off the camera and removed the battery, it will still be loaded. So be careful not to touch it - could get painful.
Hope it helps someone, a coolpix 990/4500 fan.

I HAVE SOLVED THIS PROBLEM!!
wilding2004's solution won't work with a 4500 but you must take it apart.
The problem is that the viewfinder adjuster is connected to the lens adjuster and somehow (this is the mystery) it comes off and eventually jams the lens mechanism. Tapping the camera on the back of the lens assy while it is making noise m i g h t knock this piece loose, but it is not fixed and for sure will jam again.
I have written instructions but it is not for the faint of heart.
You need to be a little mechanically inclined and know how to unsolder and solder two small wires.
I will email the doc to you for a small Paypal donation.
r u g g b a t n c d o t r r d o t c o m

I just fixed this problem with my Nikon 4300. I removed the backplate and separated the electronics from the case by pulling all the ribbon cables. I did a visual inspection for damage, (burns on pcb etc). Then I used a very small screwdriver to work the motor axel for the lens. This freed up the lens which I tested by connecting to power. Then I re-attached the ribbons and put the case back together. Everything works again. You MUST make sure you're free of static when touching the internal pcb.

Nikon Technical Support Team can advise you re this. If it is a new[ish] camera it may be replaced If not then it is time to buy the next one.