Tune Failed

[makepeace1]

Hi I have got a dreambox DM800HD

Last night i was watching tv and all of a sudden it froze on the channel that i was watching and said tune failed and i couldn't get it to show any channels at all

I tried it earlier today and i could get BBC 1 for all of 5 - 10 seconds and then it went to tune failed

I have tried again tonight and then restored it to the base image that i have got that i know worked but still nothing

I have tried doing an scan and i it does pick up some channels but not all of them mostly channel 4 and E4
The Sat - SNR is showing as 43%

I have got a I have tested it with a freesat box and that is able to pick up all the channels but the dream box can't

Anyone any idea's what i need to do seen as its ok on the freesat box ?

This is the tuner that i have got in the dream box
BSBE2-801A

I have also noticed that when i change channel that the screen on the front of the box seems to go very dim and flickers

Thanks in advance

[digicon]

Before you go to the expense of buying another tuner card it may be worth a try and get a new power supply and see if that cures the problem only a few quid on the Bay