  A few classes of the light curve of the black hole candidate GRS 1915+105
have been analyzed in detail. We discover that unlike the previous findings,
QPOs occasionally occur even in the so-called `On' or softer states. Such
findings may require a revision of the accretion/wind scenario of the black
hole candidates. We conjecture that considerable winds which is produced in
`Off' states, cool down due to Comptonization, and falls back to the disk and
creating an excess accretion rate to produce the so-called `On' state. After
the drainage of the excess matter, the disk goes back to the `Off' state. Our
findings strengthen the shock oscillation model for QPOs.
