i have been gifted a DVD player with following specs.
make: apex
model:ad 1110w
i am unable to play any dvd,but can play mp3files.
player was purchased in USA.
i am in india.

I'm not an expert (or an official researcher,) but, yeah, I'd bet
you're running into a DVD Region Code situation.

The USA (and Canada) is DVD Region Code 1. India (and some other
countries) is DVD Region 5.  It seems likely that the USA-purchased
DVD player is coded to Region 1 and that any DVDs you've acquired
locally are Region 5 and won't play on a Region 1 player.

Supposedly, it's possible to reset the region coding for some DVD
players, but I don't know if this is possible for your particular
model, nor how you might do about doing it. There are probably
websites and newsgroups with further information on how to hack your
DVD coding, but who knows if their information is good...

http://dvd.box.sk try this link for the info pls

and search this ones from p2p programs (anydvd),(dvdgenie) 
or use this forum http://forum.rpc1.org/portal.php
(dvd region info) - to learn the exact model of your dvd player 
you can have dvd region info dl link with this link
http://www.remoteselector.com/download.htm.

or http://www.inmatrix.com/...es/dvdgenie_download.shtml

http://tdb.rpc1.org/ use this freware maybe they can help you.

I found 2 different possible ways of hacking your Apex AD 1110W.

"There is no known way to make the AD-1010W or AD-1110W truly "region-free" 
or "VCR-friendly".

However, it may be possible to "force" your player to be region-free.
More details below.

And, in the case of the AD-1010W, some units come with VCD support 
disabled from the factory. VCD-enabled firmware from the AD-1110W
(yes, 1110W, not 1010W) is available, and can be loaded on the
VCD-disabled AD-1010W units,
in order to gain VCD support. See below."

The previous text was taken from
http://www.nerd-out.com/darrenk/1110W/AD1010W-1110W.htm

Additionally, on this page
http://www.dvd.reviewer.co.uk/forums/thread.asp?Forum=176&Thread=494122&Page=3&Type=1
Esperance posts his way unlocking the Apex:
"I found a hack that works on my Apex 1110w. While the dvd loads, just
click "program" repeatedly until the program menu comes up. This takes
a lot of patience and practice, though, because if you click too
slowly, it won't work, and if you click too quickly, you'll flip by
the menu and get the "wrong region" message and have to start over.
Like I read from several others who try hacking this model, the player
begins a grinding noise when it's trying to work with the
out-of-region dvd. With mine, I know it's time to slow down the
clicking after the second time my machine goes
"whirrrrrrrrrrGrindPause." I slow down from a fast pace to a steady
pace, and then I can usually catch the program menu page.

Now you have to enter chapter info for the scenes on your movie. A
"start" option appears at the bottom when you fill in the first line."

Hope these pages help. G'luck.