HAVE A BIG PROBLEM

Hi!
I bought a sansa e250v2 (2.0gb) and now i cant even put any videos or photos on it. i try to convert videos from sansa meida converter but that says that i need to plug in the sansa mp3 even though my mp3 is plugged in properly. can you lpease help me?
reply me on my email: ali4life1993@yahoo.com
P.S Can you tell me if i need to take my mp3 player back to the shop i bought it from and get a refund or you think its working good?

From pp. 19-20 of the manual:
You can use the Sansa Media Converter to transfer photos and videos to your
Sansa player (available for download at www.sandisk.com/support/sansa).
The Sansa Media Converter supports the following import media types:
• Still Image Files: JPEG, TIFF, PNG, BMP, and GIF.
• Video Files: AVI, MPEG-1 & MPEG-2 in MPEG, MPG, MPE or VOB
(unprotected) formats. MPEG-4 in AVI format, DAT, ASF, QuickTime MOV,
and WMV.
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NOTE: QuickTime 6.5 or higher and Windows Media Player 9 or 10.0 are required
for QuickTime MOV file. Error message will appear if not installed.
Sansa Media Converter software lets you convert photos and videos as appropriate,
and then transfer them to your Sansa player. Sansa Media Converter offers
features such as cropping, rotating, and resizing before transferring them to your
player as well as the ability to transfer photo and video files to your microSD card.
Refer to the Sansa Media Converter software for file formats supported.
To transfer photos and videos to your Sansa player, follow these steps:
1. Connect the Sansa player to your computer.
2. Select Converter using Sansa Media Converter on initial connection.
3. Click Add Media to select photo or video files to be converted.
4. The Sansa Media Converter will store all converted files in My Album. Click
the Album Name box and type in the name you want.
5. Click to start the conversion process. A status box will appear
showing which file(s) are being converted.