Tomtom Navigator 5.21 but no back light - Plz help

[dj_factor]

Hello, i just installed tomtom 5.21 on my spv5000, it runs fine but after a few secs the light turns off. Can someone please help me with it. I used to run it on my xda 2s n Xda II and it used to work fine.. not that i have upgraded it to 5.21, the light goes off..

10x in advance