Question about Sony VAIO VGC-RB42G PC Desktop

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Sony vaio desktop wont turn on

Green light blinking, making a ticking sound. I opened the case unplugged all wires to the motherboard, waited 10 min , plugged back in, light went solid. Still will not turn on.

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  • JDTec
    JDTec May 11, 2010

    Is it a clicking sound? is it coming from the front of the unit?

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  • 11 Answers

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.

Hope this helps you.

Posted on Dec 29, 2008

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My sony vaio eb (e series) wont turn on, the power button flashes green! PLEASE HELP!


test all power and data leads that attach to your hard drive SATA

the leads from your (motherboard to your hard drive) make sure they have a secure dust free connections and are not faulty


make sure all leads that are attached to your drives dvd\cd have secure connections and are not faulty


even something as small as faulty fan lead can cause you problems

computers need all of the data and power to travel through every working device and to have an end for a computer to be able work properly


a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive check all power and data leads make sure they are securely seated even the cd/dvd drives need to have current go through make sure these devices are working


check the CPU central processing unit make sure it has thermal paste and dust free secure seating


also check your computer ram modules and cmos battery make sure it has charge and they are dust free and securely seated some motherboards cmos batteries are soldered in


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1 Answer

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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 and next to a green blinking 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.

If the steps above don't work you will need to get a new power supply.

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My vaio wont turn on and the green light in the back keeps blinki


The green light blinking in the back indicates that the power supply went bad and is not turning on, go ahead and get the power supply replaced. Normally that light is supposed to be fully lit and green.

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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.

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Unplug the tower

Remove the ram and turn the tower on wait till it give you fast beeps. (telling you no RAM)

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Could be a bad power supply or a bad motherboard.

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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.

It worked twice for me; I hope it works for you.

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1 Answer

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Unplug computer, disconnect all usb/monitor/internet, open it, hold power button until green led on the inside on the motherboard turns off, pop out the BIOS battery (looks like a big watch battery and use a small flathead screwdriver to depress the spring lock on one side), plug in computer, hold power button for about 20 seconds (must reset BIOS or something), let up on power button, wait 10 seconds and push power button. The computer should turn on. Wait for it until activity seems stable (1 min. or so). Push powerbutton to shut off.

If this has worked you have proven that it's not the power supply (it turned on).

Go buy a new battery (CR2032 3 volt). Unplug computer, open it, hold power button until green led on the inside on the motherboard turns off, pop in new battery, plug in (you should notice the power button blinking amber again), hold power button until it stops blinking (about 20 sec....again must reset BIOS or something), wait 10 sec., push power button. the computer should turn on. Wait for it until activity seems stabe (1 min. or so). Push powerbutton to shut off.

Now, close case, plug in all usb/monitor/internet/etc. Power up computer. You'll get an internal floppy drive error. Push F2 (maybe F1) to get into the BIOS settings and go to "drives" and turn off the internal floppy. Save and exit. The computer should boot properly now.

This seems to be a big problem with the e510, my theory is that this one small battery is the root of most of these failures (as these computers usually fail after 1-2 years), not the power supply or the motherboard (heck, when you replace the motherboard it comes with a new one of these batteries...a several hundred dollar piece of hardware, with a $5 battery that will actually fix it).

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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.

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