Your monitor is fine, the shirt however, is not. Depeneding on the lighting the shirt appears both green and grey. If you look very closely you can see that the shirt is actually comprised of many QBert boards. The big question is: where the hell is QBert? Time to bring Lenoard Nimoy out of retirement for one last "In Search Of" episode.
***Warning***
USERS MAY EXPERIENCE EPILEPTIC SEIZURES WHEN EXPOSED TO THIS SHIRT'S LIGHT PATTERNS