My 645 got abondonded at a friends house a week before Xmas beacause a/ he lives at the bottom of a very steep hill and b/ over a foot of snow fell within hours and the temperature dropped to -16c. When I left the car all was in order. When I retrieved the car on Monday it started no problem but the instrument cluster was dead, no speedo, rev counter, temp or fuel gauge, no warning lights, computer display or indicators. Wipers, electric columb, iDrive, radio all still work. Apparently, if the battery goes low the computer switches off what it deems unnessesary to preserve whats left in the battery. All well and good but how do I get it to switch back on? I have driven the car around for a day (doing hand signals as there are no indicators -in the rain) and I am about to put the battery on charge to see if that helps. If anybody out there knows better I would be grateful for advice.