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Re: VAIO VGN-FS 770W wont turn on
Try to remove the AC power and then the battery. then plug in the power without the battery. Turn-on the Laptop if it starts then slowly put the battery back after it boots in windows. Check if the battery is charging.
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A way to check to see if the machine is overheating is when you turn on the computer, there should be an option to hit F10 or F2 for the bios. In there, there should be a few temperature readings. Let the machine idle and in the bios if the tempature rises in there there could be an issue with the cooling for the CPU.
I have a Sony VAIO GRS170/GRS175 in use almost every day since 2003. It used to turn off regularly during hot summer days even with its battery fully charged and plugged in. The problem was eliminated by using a small fan to blow air at its side where the air intake was located. Later, the fan was replaced with a notebook cooling pad which was more convenient. You could first try using a fan to see if it makes any difference. If you don't get anymore shut downs, then the problem is definitely due to overheating. You could then replace the fan with a notebook cooling pad.
I had a similar problem with another vaio turned out that the module that the power button is a part of (above the keyboard) had a bad wiring harness that connects it to the computers main board. After replacing the harness (looks like a tiny ribbon cable with 4 or 5 wires) the laptop was great again.
Try having your battery tested. There may be not enough power to run everything on your comp.
Anotherthing to consider, if your CPU fan isnt working the bios wont start the O.S. as the CPU will overheat and shut down automatically. Good Luck