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monitor going to sleep when computer gets turned on means there is no video signal getting to it from motherboard. There are few reason for this. First thing to do is to reseat cables for monitor which is usually black cable with blue wide ends and it has 2 screws the can be used to fasten it to tower or monitor it self. just remove then cable and out back in. if this does not work it is possible that drivers are corrupted or video adapter is bad. to find out is it just bad drivers you would need to boot in to safe mode which only loads simple drivers. to boot to safe mode shut down your pc and when you push the power button to turn it on keep on tapping F8 key located at the top of keyboard. dont just press it and hold it pressed but keep on pressing and releasing. you need to keep on doing this until a black screen comes up with white writing and it will say advanced start up menu. once you get to this screen you need to choose safe mode with networking just so you can go online to hp support site hp.com and download new video drivers which are under support and download. once you choose safe mode with networking computer will start loading files and after few minutes it will bring choose account to log in. make sure to choose administrator if it displays and if not just choose your usual log in. if this works you now know it is just corrupted video drivers and just need to go to hp site and download new ones. another way to fix this kinda problem is to do system recovery to a date you know monitor used to work. to do system restore you would click on start and then choose all programs and select accessories, system tools and then system restore. you will choose restore computer to an earlier date or time and just choose a date from the calendar that you know computer used to work fine. all this would still be done from safe mode. if you are unable to get to safe mode this would mean you video card is bad and needs to be replaced. 90% computers have their video cars soldered on mother board so this means cant be replaced so easier way to fix this is to just add another video card that can be purchased in any pc store. you dont need anything fancy just a vista compatable. if you have a warranty i would have a pc repair person do this for you and even if you dont you can talk to geek squad and tell them to give you a compatible video card and install it for you. Hope this helps. Any other questions email me at email@example.com
Solid Amber Power LED is indicative of a Motherboard failure. Replace the motherboard.
The GX280 is one of many motherboards made during that time period that may have had capacitors that could fail due to a manufacturing defect if the capacitor. Check the capacitors on the motherboard to see if the tops are popped (there is a X engraved across the top of each capacitor, it the X is open, then the capacitor is bad.)
since we dont actually know where this problem comes from,
i advise u to format ur system and reinstall windows so d problem be solved.
try starting yr system in save mode by pressing f8 key during booting, and choosing the option save mode.