Is the charge light coming on when you charge it?
That sounds like it could be faulty motherboard (not giving out a signal to the lcd) or a faulty LCD. Unfortunately diagnosing the problem will probably mean re-flashing a rom (with a pc) and losing your data (the programs and settings, not the files saved on your sd card).
When you flash a rom there will be a message displayed on the screen of your vega (NV flash somethingerother....) If you see this message on your vega screen you should be OK when the installation is complete. If you see nothing on the vega screen but the program on the pc is installing correctly then you LCD is probably at fault. If the installation fails its probaly the motherboard.
Install moddedstock http://android.modac...edstock-110-v2/
Heres the DL links as the one on the thread is dead
Heres a moddedstock and vegatools (helps install the drivers on you pc) install guide I did for someone else.
To place the Advent Vega into NVflash recovery mode:
o Turn the Vega off by holding down the POWER button for 6 seconds
o Once off, hold the BACK button down for 2 seconds
o Then, whilst keeping the BACK button held, press and hold the POWER button for 2 seconds
o Then release just the POWER button but keep holding the BACK button for a further 2 seconds
o Release the BACK button
The Vega will not light up but it should in NVflash recovery mode
(This previous bit is tricky even with a working LCD, because your LCD not working is look for the camera blue light, if you see it come on when you are trying to put it into restore mode then you have done it wrong. hold down the power button until the light goes off then try again.)
If you have done the Back button thing correctly you will be in recovery mode You can now run the moddedstock exe file on your pc and begin the install.
The file will be extracted, and then a command prompt will open and run automatically and send the files to the Vega. It will take about a minute and when its done you can press return (when prompted) to close the command prompt.
You are now running ModdedStock "