My laptop(dell) not DETECT lexar 2 GB SD(MULTI-USE).

You can try using a file recovery software like Bad Copy Pro 4.10.125. It works well for me.

It's a lost cause. The A540 works with SD cards. While SDHC cards will fit into the slot, they are electronically incompatible and will not work in devices not designed for them. You need to stay with SD cards, 2GB and smaller.

Apparently, you have pics on the camera's internal memory. Your card won't work until those pics are gone. Here's how...with no card in the camera, go into the menu and find "format" and follow the on-screen instructions to erase the internal memory. Then, insert your card and it should work.

SD and SDHC cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.

First of all, the 4GB card will never be able to work in your camera. Check on its face. It likely says SDHC, and SDHC cards as this format came out after your camera was designed (I know it looks exactly like a normal SD card, but it's not).

Now the 2GB card should work with your camera as it is a standard SD card. Remove the card from your camera. Look on the side of the card for the tiny slide switch, and slide it to the other "unlocked" position. Reinsert it in the camera, and see if that corrects the problem.

Moultrie told me they could not fix the camera. I removed the Lexar 512 SD card and re-ran the test. The test passed and the camera worked. I replaced the Lexar SD card with a Cannon SD card and reran the test. The test passed and the camera works. I put the Lexar SD card and got a 00400 error message. Change SD cards. It fixed the problem for me.

Although the manual doesn't specifically say the maximum capacity, looking at their accessories website only sells 1 GB cards for the camera. This tells me that the maximum capacity is, indeed, 1 GB which is not an uncommon occurrence.

That card is not compatible with that camera. It's too large for an older model like that. Backup the card's contents and format it. It should work in newer models but probably not the PDC 3070.

sure..go back and get drivers for that SD card(from maker of it(not listed here) and you might get lucky.

check your computers warranty here 4 FREE

check for the USB drivers Of the Laptop.

Could be problem with the Laptop USB Controller Driver.