It's the acer aspire 5920, he's got:
Windows 7 (was native with windows vista)
Cpu: Intel core 2 Duo processor T5750 (2GHz, 667 MHz FSB, 2 MB L2 chace)
Ram: 4 GB of DDR2
For info on HDD and the ram brand I'll need to boot this thing by an usb and check them, I'll be able to do that in an hour or two
While not applicable 100% the time, the power outage usually causes damage to the filesystem specially on SSDs. This doesn't mean that the hardware is gone completely, only the data on it may be inaccessible any longer. That is why it is very important to regularly make a back up of your SSD.
If that is the case simply taking out the disk would make the laptop boot up again. But most likely with an error message reporting that there is no boot media available.
If that is the case you can certainly be sure that the disk is the problem.
The fact that it is bootable using a usb also hints towards this analogy as well. You can use that to try and see if your information on that disk is retrievable or not.
I hope this is not a hardware problem and that you can get your data back. Cheers.