Re: 17'' 800 G4 iMac, suddenly no video
On Nov 3, 2011, at 11:53 PM, a1 wrote: So what are the standard steps for this situation. iMac was on, I came back in the room and the screen was utterly black. Rest of computer seems to respond i.e boots, cd drawer opens, even seems to go into sleep mode and wake. But no video. Hope this isn't fatal since its my fave mac! If you shine a bright light onto the screen while the iMac is running, do you see faint video images? If the answer is yes, then you most likely have a bad inverter, which is inside the LCD case. If the answer is no, then either the LCD died (unlikely) or there are one or more broken wires inside the neck (likely and not uncommon). It's also possible the LVDS cable came loose from its connector on the logic board, but that's highly unlikely unless the iMac has been opened up recently. You also could have a combination of bad inverter and broken/shorted wires inside the neck. If you get video on an external monitor, then you know the video chip's OK. If not, then you're looking at a loose video chip which means logic board replacement. HTH, Jim Scott -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist
Re: 17'' 800 G4 iMac, suddenly no video
On Nov 4, 2011, at 10:08 AM, Jim Scott wrote: On Nov 3, 2011, at 11:53 PM, a1 wrote: So what are the standard steps for this situation. iMac was on, I came back in the room and the screen was utterly black. Rest of computer seems to respond i.e boots, cd drawer opens, even seems to go into sleep mode and wake. But no video. Hope this isn't fatal since its my fave mac! If you shine a bright light onto the screen while the iMac is running, do you see faint video images? If the answer is yes, then you most likely have a bad inverter, which is inside the LCD case. Or a failed backlight bulb, also inside the LCD case. -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist
Re: 17'' 800 G4 iMac, suddenly no video
What OS is it running? The very first version of Mac OS X 10.5 is prone to whiting or blacking out the screen due to incompatible screen drivers that came with it. This was fixed with Mac OS X 10.5.3. On Fri, Nov 4, 2011 at 2:53 AM, a1 arichic...@gmail.com wrote: So what are the standard steps for this situation. iMac was on, I came back in the room and the screen was utterly black. Rest of computer seems to respond i.e boots, cd drawer opens, even seems to go into sleep mode and wake. But no video. Hope this isn't fatal since its my fave mac! -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist
