hey guyz i am using a Philips 107C5 monitor for the past 1-2 years without any issues .. but recently something weird has started to happen .. whenever i switch on my pc , the monitor gives a faint looooong beeping sound for around 20 secs and i can see waveforms on the screen. this happens as soon as my operating system loads i.e it happens around 30-40 secs after the monitor is turned on. the sound and waveforms continue to be there for around 20-30 secs and then everything becomes okay .. what could be the problem guys ????