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It could be a problem with the motherboard, basically because the power supply to the laptop is built in to the motherboard. I would first check the battery though. Sometimes this can happen with a bad battery, even if the laptop is plugged in. Try removing the battery and using the laptop while it's plugged in with no battery.
If it works fine with no battery and power cord connected, I would get a new battery.
If it is still a problem with the battery out, it's likely it could be a problem with the power supply that's part of the motherboard. If that's the case, I would try to call Sony and see if it is covered under warranty....or if they have had problems with this. With a year old laptop, this should not be failing like this.
Could be a number of issues. Try the simple trick of removing battery and power cord and pressing the power button a few times to drain any static electricity. Replug just the power cord, NO battery, and they try starting.
If this fails, you might be looking at a problem on your motherboard. Motherboard repair will range from $100 upwards to $250. Unfortunately if the above doesn't solve it, you'll have to take it to a laptop repair store to diagnose the problem. We offer free checkup on laptops and I'm sure laptop repair stores in your area can check it for free and let you know the problem before you decide to fix.
You can visit our website for free laptop repair help: Laptop Repair Mississauga http://www.laptopmart.ca
Motherboard is faulty. You can try removing the hard drive and dvd drive to make sure those aren't shorting out the motherboard. You can also try each memory stick to make sure neither one is shorting out the motherboard.
Sounds like the GPU is after failing (or the motherboard). Honestly, not worth repairing, as either problem will involve replacing the motherboard, which is dearer than a new laptop (unless you can salvage one from somewhere).