I don't own the A120 anymore. That is almost similar to this, as you might know.
Anyway, as nobody has answered your question, I will try to help as much as I can.
Does it give you a haptic feedback(vibration) when you try to power on the device?
Are you saying that it won't turn on completely?
If it is being detected on the computer and not on SPFT, you might want to check with the drivers you have. Do you have the MTK VCOM drivers installed? (I'm not really sure about the name, but it was something like that).
And try flashing the Stock ROM with SPFT with your battery removed from the phone.
Download the drivers.
Connect your phone without the battery and keep your device manager open, if it shows a device with a yellow exclamation mark beside it, right click and click on properties. You will have to do this quickly.
Once that is done, go to driver tab on the properties window. Select Update Driver. Browse my computer and enter the location of your downloaded and unzipped drivers.
(You might get a digital signature error or something similar. I'll tell you how to bypass that in the end. If you get that, go to the end, follow those steps and then come back and do all the steps after the downloading part.)
If the drivers are successfully installed, then unplug your device, run the SPFT and load the Scatter file of the Stock ROM.
Now select Download only and start the download, it will wait for you to connect the phone.
Plug in your phone without the battery. This should initialize the download process.
Now wait for the flash to be completed and if it is successful, take out your phone and boot it. If it boots up, congratulations.
If it does not, flash the same ROM the same way another time and check, if it is still not working, try with Firmware upgrade mode, twice. It should work in those tries.
Digital Signature Error bypassing.
I know only one method which works on Windows 8 and above(Tested).
Hold the Shift key while pressing Reboot.(Yes, you have to reboot your PC)
Once there is a blue screen with options, you should see "Troubleshoot". Select that.
Then Advanced Options and then Start Up settings. Then press Restart.
This will show you a menu with a lot of options. Select the option number which says "Disable Driver Signature Enforcement".
This will log you into the PC normally, but now, you can go back and do all the steps again and you won't get an error.
Cheers!
If this still doesn't help you, let me know on what happens so I can try to get you back your phone. Hope this helps.