My Imac, purchased in Feb. 99 has reacted to something.. but not sure it is serious or just what..at unexpected times, the monitor will shrink to an hourglass .. I thought it might be power changes.. (low power).. I checked my power plug and made sure it was a solid connection.. but can it mean the monitor is getting bad? Is there anyother thing to check? I have ran Norton Utilities etc.. no problem.. so??