You wont need a BIOS update, who told you that you do? Am I correct in assuming that this is a flat panel monitor as opposoed to a CRT monitor? If so, chances are there could be one of two things wrong. Either the refresh rate is incorrect or the monitor's power supply is on the blink (I had a similar problem with my own last week and had to buy a new power supply for it). Go into the monitor's settings and check the refresh rate. If it seems okay, check the monitor power supply otput voltage using a meter, they're usually about 12 volts output.