tomtom 520

my 520 keeps asking for memory card and won't boot from internal memory
also when it does run it reboots itself after a short time

Thanks for sharing that info with us.
But do you have any actual questions?

thankyou for this hope it works tried every other way will keep you posted on the out come

Why do moderators have to be sarcastic. Everyone needs help sometimes. Posted thread as a problem, not as information

I agree, but you have not asked for anything, you simply made a statement.
I already asked you if you have any questions.
Sorry, but I can not read your mind.
So please, if you want help make a complete posting including the necessary details.

my 520 keeps asking for memory card and won't boot from internal memory
also when it does run it reboots itself after a short time
iv'e formatted also done total install and activated map and patched navore
but after a short distance it starts to reboot itself
trying to read card then internal memory but when i connect to tomtom it comes up as 2 memory cards not internal memory and memory card can anyone help with this dilema

1. I don't see any sarcasm in post 2. Downunder pointed out that you only posted info & asked if you had a question.

2. Have you done a hard reset & run the TT Clear Flash Tool ?

yes done both also tried different memory cards also different navcores and maps
one thing i have noticed is when i look on the internal memory its deleting the ttgo bif file

Just to get it all together here :
The SD card has to be in FAT or FAT32.
The Navcore has to be installed in the root of the device/SD card.
To make things short :
Connect your TT to the PC and use Home to update your device to the latest official Navcore.
If you only use the SD card for that, make sure you have a copy of your original ttgo.bif on it.
If all is working overwrite with the Navcore of your chioce and add a map.

downunder thanks have done all of those as you sugested but it still did the same thing it deleted the ttgo bif from the internal memory

What do you mean "it still did the same thing" ?
Have you installed the official Navcore using Home?

yes updated through tomtom ie navcore on both internal memory and on sd card then let tomtom restart the device
thats when it starts to reboot it self
it starts to read the card and before the blue line reaches the end it starts to read the internal memory
and it just keeps doing that over and over

Only with a Navcore and no extra content like maps the TT should boot normal.
Without the SD from the internal memory otherwise from the SD.
Please confirm there nothing else on the TT other than the Navcore.

on the device just the navcores after the rebooting i do a reset to stop it then reconnect to tomtom home and the device comes up as 2 memory
cards and when i look on the internal memory thats when i find the ttgo bif has been deleted

Had a read through this and it sounds as if your internal memory is buggered.
Without an SD card in (you need to prove one way or the other if your internal's working), if you cannot connect to TTHome & check for updates etc and it won't boot up properly then there's something wrong with the internal memory. If that is the case then you'll need to run everything directly from an SD card (navcore/voices/maps etc)

Have you tried running the clearflash.exe from tt.com