Nikkor 18 - 55mm f/3.5 - 5.6G lens problem?

It won't auto focus.i've set it to A but nothing happens. I hear a clicking sound, but no auto focus.there's no problem if i adjust them manually.need help. Is it broken? Or just something that i must tweak at the settings?

Added (1). Oh.i've never dropped the camera. Just saying.

2 Similar Lenses from Nikon Different Prices. What gives?

Saw this on Ebay, i just converted the price to US Dollars

Nikon Lens AF Nikkor 70-300mm f/4-5.6G $139

LINK
http://cgi.ebay.ph/Nikon-Lens-AF-Nikkor-70-300mm-f-4-5-6G-brand-new-/370526347288?pt=LH_DefaultDomain_211&hash=item5645176018

Nikon Lens AF-S 55-300mm f/4.5-5.6G ED VR Lens $315

LINK
http://cgi.ebay.ph/BRNDNEW-Nikon-AF-S-55-300mm-f-4-5-5-6G-ED-VR-Lens-/250853436611?pt=LH_DefaultDomain_211&hash=item3a6807acc3

Now i know Nikkor is a Nikon brand so what's the difference? I mean yes i can see the 55 and 75 difference in the lens but what will make me want a 55mm from a 75?

Also, the AF and AF-S? Is that a big deal i mean my camera has those focus modes

Noob in cameras

Can you clean dust from the inside of the elements?

I'm looking at a nikon nikkor 80-200 f/2.8 lens on ebay and it has some dust on the inside of the elements can you clean that or will it not make any difference to the pictures

Where i can get a cheap nikon nikkor 80-200 f/2.8 lens for?

I'm looking for a cheap nikon nikkor 80-200 f/2.8 can any one help me out.

AF-S DX Micro NIKKOR 85mm f/3.5G ED VR vs Micro-NIKKOR 55mm f/2.8?

I'm looking for a good macro lens and I'm debating between these two. The 85mm is about $100 more expensive but has AF. Which one should I purchase?

Which is a better lens to use for firework photography?

Hi can anyone help me with my question? This coming 4th July will be my first time taking a firework photography, so is it okay to use a 50mm f1.8? I'm just starting out and Nikkor 50mm f1.8 and 18-105mm f3.5-5.6 are the only lenses I've got. I need a professional answer for this.many thanks!

Added (1). Nikkor 50mm f1.8 + hoods
Nikkor 18-105mm f3.5-5.6 + hoods
I have a tripod

Additional Information: I understand how exposure and ISO and Aperture and Shutter work, I just need an opinion as to which lens to use.

Photography websites with pic info?

Yo! Do any1 know any photography website with picture samples or where people post it including information such as exposure, diaphragma and iso ( efix data? ) Will be happy if there something specific also about taken pics with lens nikkor 18-105…

Can I use this lens on my DSLR?

I have and old SLR lens that is a Nikon AF Nikkor 28-80mm f/3.3-5.6G, I was wondering if I could use it on my Canon Eso Rebel Xs?

What is better, nikkor 50mm f/1. 8 or 35mm f/1.8 lens?

I'm planning on buying a new lens, preferably a prime lens. At first, my choice was to buy the 35mm f/1.8 lens, but now that I see that the 50mm just recently came out, I'm having doubts.

What do you guys recommend?

Trying to decide which lens to get?

AF-S NIKKOR 50mm f/1.8G or AF NIKKOR 50mm f/1.8D

What does the AF-S mean? What does the G mean after the 1.8? & what does the D mean after the 1.8?