Zoom button does not work

Just a thought - are your Image Stabilizer and Auto Focus switches On or Off?
Might be worth experimenting with them.
Otherwise, sorry, can't help.
May be necessary to contact your vendor.

If the flash is faulty, it will most likely be to expensive to repair. You can still use the camera, though. Indoor photos will be to dark unless you turn off the flash. Cycle through the flash modes untill you get the Suppressed Flash symbol. Flash mode button is next to the zoom button. Watch out for camera shake when shooting indoor without flash.

Possibly a intermittent connection in the control buttons or the ZIF (Zero Insertion Force) connector from the controls to the main PCB.
Take it in for servicing, they will do a trial by substitution (swap out control) and lubricate the connector.
There isn't really anything you can do to fix with this sort of problem.

Cheers.

what about the menu switch, manipulate it, see what that does.

You have a bad button board . This is a single board with a series of small button switches that control all these functions. Most repair shop will charge around 75.00 to fix.

is the setup shoing that it is on MACRO? if so turn MACRO off

Your zoom may be turned off, here is how you can turn it back on:
When you are about to take a picture, press the little menu button, then press down until it says digital zoom, if the little black box is over-top of 'off' change it to say 'on'.
Hope this helps.....and makes sense.

We have a Canon A520 and it was having all the symptoms noted. Searched for a resolution on numerous sites including the Canon Support site. While on the Canon Support site, I found an FAQ on "How to RESET the A520". Turn camera on, find and hold MENU button for 5+ seconds until "Reset settings to default?" screen appears. Arrow over to OK and press the SET button. When we did this the battery low indicator showed, replaced batteries with standard alkaline batteries. Everything functions properly, with no additional problems for the past 5 days. I guess the camera just lost its mind and had to be defaulted and rebooted, hope this helps.

i had that same problem. check your image size, the camera cant zoom if the image size is set to 3.1M or 2.8M(3:2)

how to change image size:
turn on camera and leave it in camera mode (picture taking mode)
press the delete/image button
change image size until camera zooms again
VGA gives the biggest zoom range

i hope this helps
it worked on my camera

This suggests the zoom motor has failed. As you only purchased it 2 weeks ago - it should be replaced under warranty