I have recently jumped ship and moved from a PC to an iMac. I am a freelance Technical Illustrator and use Adobe Illustrator and Photoshop as my main programs. I have used the iMac for about a month now and have noticed poor performance when using Adobe Illustrator (screen lag). I contacted Apple Care and they suggested getting in touch with Adobe first. Subsequently I have been in contact several times with Adobe. It has not been resolved. Also I have recently noticed a band of light grey across the bottom of the screen. I have now contacted Apple Care again and they believe that there is a hardware fault and it is due to go for an estimated ten day repair. At what point will Apple replace a computer if it will cause loss of earnings for a one man, one computer business. Has anybody experiences a similar fault?