I have Rx 300 2000. It was in the garage for a month. After amonth
when i tried to start it didn ot start at the first try but started
thereafter. Before leaving the car for a month Volume button was
working fine. Ever since I started the car after a month there is no
volume. When i try to increase / decrease the volume i do not see the
volume graphics. I can see the CD / Tape / Radio being turned on and
the systems working but no Volume.

Would anyone have any idea about the problem and how it could be
rectified?