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1/ do you have an ethenet cable plugged in ? is this light located on this plug ? unplug the cable first
2/ check that the monitor is switching ON
3/ find a power switch at the back of the case and switch off and/or unplug the power cable, for at least 10 sec
4/ switch on/connect power cable, and turn computer ON
5/ if nothing happens, then power supply may be dead ; don't worry it's inexpensive and super-easy to change ! but first check the manual (or manufacturer) for the meaning of the GREEN LIGHT ! Then open the case and CHECK if the computer is perfectly CLEAN, or DIRTY ; especially double check the RAM modules ! Clean everything with air spray and soft brush (pull out processor, ram, cards, if you find lot of dirt)
6/ after cleaning try to turn on computer again ; if fails, go to buy a new cheap power supply that fits your motherboard, or try to find someone that can lend you one for testing
you bringing a marginal part or connection back up a working state. when it cools or voltage drops it goes to the non working state. hp power supplies are not good to begin with. replacing it will fix it till that one also fails
Try a different known working power supply on that computer, the green light on the power supply should be constant and not blinking. The green light on the motherboard shouldn't be blinking either but if its not getting the right voltage from the motherboard then it will blink as well.
Get a different power supply and see what happens. At that point the power supply green light should be constant, if its not then your motherboard is faulty at that point, if yout the green light is blinking on your motherboard, if both are constant then reseat the memory and CPU and only have the power supply hooked up to the motherboard and not to anything else.
If you still can't get video then at that point you know the motherboard is definitely bad.
Chances are your power supply and computer is fine! From other forums on this problem (which I also had), I've learned the following: 1. If you unplug the computer for a half hour or so (the blinking green light will gradually slow down and quit) and plug it back in, the situation will correct itself and the green light will be steady; however if this does not work, 2. a reset that works for a lot of people with the blinking light problem involves leaving the power supply plugged in and unplugging the power supply connection at the motherboard (it usually also has a blinking green LED) and plugging it back in. To read up on how to do this, Google "blinking green light on computer power supply" and read through some of the forums and you'll come on more specific instructions. Usually, you have to wade through everybody telling you to replace the power supply or your motherboard is fried. It's worth a try for a quick fix, just in case those situations don't apply!
I've had that happen twice to my Vaio desktop and there was a very easy fix. I'm not a techie, but I found a recommended solution online when this first happened six months ago. I couldn't find the solution again, but I fortunately remembered the steps.
Remove the side pane to access your motherboard cables, etc. Locate the connector on your motherboard that contains the wires going from your power supply to your motherboard. It will be a large, rectangular connector with a lot of individual wires It is not a ribbon cable but should be located next to a ribbon cable connector andnext to a geen blnking light on your motherboard (when the power supply is plugged into the wall). Note: This green blinking light is in addition to the green blinking light on the back of the PC.
This next step is important: You have to disconnect the connector noted above from the motherboard WHILE the power suply is plugged into the wall. Wait a few seconds and plug it back in. The blinking reen light on the motherboard should now be a solid green light. The PC should now power up.
This type scenario normally indicates a power supply failure. Try connecting a known good power supply to your Sony Vaio desktop.
If you do not have a spare power supply, (many people do not) the alternative is to short the the black and green wire on the power lead connecting to the motherboard using a paper clip. This is not a desirable solution and very dangerous, but will help to diagnose the problem. Do not insert any objects while the power supply is energized. Ensure it is unplugged first.
Should the computer start with the green and black wire shorted, the problem is with the power supply. If not, the problem is likely at the motherboard level.
when working on computers you have to be carefull to ground your self before touching the inside of them. when installing memory you dont need to unpluge everythinf just the main power cord on the back of it.the blinking green light means you have something no pluged in right,double check everything you unpluged make sure it back in the right areas.on memory the slots are mark 1,2,3,4
make sure if the memory is diffrent in speeds the lagger ons go first.the first to slots normally have to be the same speed and size ram.if that does not work let me know i can look into it for you.
I had the same exact problem for the same exact reason. Plug the power cable into the back. Open up the side of the case and unplug all the wires that the power supply plugs into. The motherboard, harddrive, cd & dvd drives, everything. wait about 10 minutes and plug them back in, plugging the BIG cable that connects to the motherboard back in LAST. This will make the light go from blinking to solid. I think it is a safety? to protect the motherboard from damage.