VU+ Duo vu+duo odd prolems ??

hi guys - got a vu+duo genuine , ive had the latest bh image running perfectly, until a few days a go, when all of a sudden i just got the "red light of death", anyway after searching the net , replaced capacitor c807 i think it was, switched on the vu+duo, ooted up and worked fine and after a few minutes screen went blank..no signal hdmi port 2...rebooted box, it just got stuck on starting..rebooted agin worked for a while then went off...no hmi signal,...now at this moment its went past starting and is stuck on "vu+duo" on the display...no hdmi signal on tv...seems its having intermittent problems, i tried to flash it again but as soon as put in the usb stick on any port, it says on display "finished remove usb and reboot" within 3 secs after reading usb....weird///looks like there may be some hardware problems ..any ideas ta?

Wondering if its linked to the voltage regulators that the cap helps to protect.