  GRO 1655-40, a well known black hole candidate, showed renewed X-ray activity
in March 2005 after being dormant for almost eight years. It showed very
prominent quasi-periodic oscillations. We analysed the data of two observations
in this {\it Rapid Communication}, one taken on March 2nd, 2005 and the other
taken on the March 11th, 2005. On March 2nd, 2005 the shock was weak and the
QPO was seen in roughly all energies. On March 11th, 2005 the power density
spectra showed that quasi-periodic oscillations (QPOs) were exhibited in harder
X-rays. On the first day, the QPO was seen at 0.13Hz and on the second day, the
QPO was seen at $\sim 6.5$Hz with a spectral break at $\sim 0.1$Hz. We analysed
the QPOs for the period 25th Feb. 2005 to 12th of March, 2005 and showed that
the frequency of QPO increased monotonically from 0.088Hz to 15.01Hz. This
agrees well if the oscillating shock is assumed to propagate with a constant
velocity. On several days we also noticed the presence of very high frequency
QPOs and for the first time we detected QPOs in the 600-700Hz range, the
highest frequency range so far reported for any black hole candidate.
