Says memory is about 1/2 full but does not show anything on handheld or computer and i can not put anyhting new on

The internal memory or the memory card of your camera is full. At least there is not enough memory free to save anything.
If you can't do anything, remove the battery, then remove the memory card and try to rescue the pictures on that card. There are recovery programs online, if you do have important pictures on the card. If you are ready saving, or you don't need anything from that card, try to format it on your PC. Just FAT will do. Then put the memory card back in and give it a format in the camera. Just to make sure the format is known bin your computer.
It could be there is no memory card in your camera at all, Because you forgot you did put it in another camera. Then just place a new one. BUT TAKE CARE. You only can use SD cards, because your camera is from before the SDHC period.
Or is a SDHC card in the camera already? that is the culprit.

What size is the memory card. If it's larger than 4GB then it won't work in the 5118.
Try using another card. Don't format it in your computer but do format it in the camera before trying to take pictures.

Your battery is losing voltage too quick. It has probably developed a 'memory'. Dyson claims that their handheld has the best suction out of all the handhelds out there. In order to maintain that claim the circuit board will shut off power to the motor when the voltage drops below adequate charge for full suction.
We need someone who can teach us to bypass that part of the circuit so it won't cut power to the motor or you need to get a new battery.
Shorting the battery like an Aircraft battery then re-charging won't fix it.

ok the first thing to do is find out is , is it the phone or the memory card, so try another memory card. with a bit of luck it will be the card that is unstable. if its not the try updating the the firmware on your phone but do it using the pc suite that maches your phone and backup your entire phone contacts pics etc to your computer. now dowload and install the update usually the pc suite will do this for you. i hope that helps.

u just format phone then u try it

format it and run avg on it

.avi format is not supported by 6680 your need to convert video to .3gp format and the resolution of video should be 176 x 208 pixels

I had several cases lke this with clients. One of the dictations is corrupted. It's the "one" here that matters. When you connect the DS-4000 to a PC, it appears in your "My Computer" as a Removable Drive. Browse this drive, and you will find the dictations in one of the folders (A, B, C etc...) or they might be scattered between folder depending on how your user records.
Try to copy dictation manually from that drive to the matching folders on the PC (by default My Documents-->DSSPlayer-->Messages-->FolderA, FolderB..., although you might have changed that).

At some stage one of the dictation files will refuse to copy/paste: that's the corrupted one; however should should be able to save the others. Once you have salvaged all but one dictation, you can do a format of the card. In fact, I suggest you chage the card, as corruption is usually a sign of worst things to come...

Using this procedure, at least only one dictation will need re-dictated.

I hope this helps.

sounds like the memory is full

look and see if there is anyhting in memory, here is the manual
http://www.retrevo.com/s/brother+1840c+manual

1- formate your device using the memory format option in device settings menu 2- connect your device to computer and then see the driver shown in my computer folder if still show there are only 50% so do quick formate using window ..