ca sa te putem ajuta trebuie sa ne spui si noua versiunea (slim, E, cu sau fara HDD...etc). Uite ce am gasit la prima vedere https://www.google.ro/search?client=...hannel=suggest

Dupa o cautare mai atenta am gasit mai multi useri care se plang de aceasi problema, in special la Xbox-urile cu memorie interna de 4 GB : Re: Xbox 360 Slim Will Not Go To Dashboard Upon Startup - Xbox General Discussion - Community Discussion - Xbox.com Forums - Xbox.com

Ideea e ca ar trebuii sa faci update de dashboard :
Download the Dashboard Update ReTro aG & save it to a USB Flash Drive, then plug it into your console to update the dashboard...

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Copy to a USB flash drive

If you cannot connect your Xbox 360 console to the Internet, you can copy the console update from your computer to a USB flash drive and then install it on the console.

Note The USB flash drive must use the FAT32 file system.
Plug your USB flash drive into a USB port on your computer.
Download the update file.
Click Save to save the console update .zip file on your computer.
Unzip the file. If you are using Windows XP, Windows Vista or Windows 7, double-click the .zip file to unzip it.
Copy the contents of the .zip file to the root directory of your flash drive.
Unplug the USB flash drive from your computer.
Plug the flash drive into a USB port on your Xbox 360 console.
Restart the console.
When the console restarts, the installation program starts automatically. Select Yes when you are prompted to update the new console software.