If it doesn't boot into the BIOS it's certainly not the hard drive. If he changed that, he's a bad repair man. So let's assume your memory doesn't serve you good.
So it's the PSU, the motherboard, the CPU or the RAM. And since (if your memory is right) it isn't the RAM it's the PSU, the motherboard or the CPU.
Hi, im an owner of a netbook called Lenovo Ideapad S10-2 and just a month ago it stopped working all of a sudden (trough one night).
When i press the power button i hear some fans for 2-3 seconds and then they get silent and the screen itself doesn't show anything it doesn't even illuminates the screen.
I tried hooking up an external monitor and i couldn't see anything and i even took the netbook to some repair man and he changed RAMs and even hard drive (if my memory serves me good ) and he couldn't get it to boot into windows.
So my guess it must be the motherboard right ?
What is your opinion on this guys what could be the problem?
And if you need additional just ask away.