going all digital, boosting pc signal

So here's the deal I made a custom car pc it works but the cable from the screen to the pc is like 3ft so I extended it and now the screen flickers. So im trying to rule out my Hu now. Is there any way I can boost my PC's sound signal to three different amps like a HU would Do. I was thinking active crossover but any suggestions1993 sdv

Alpine 4x6 6x9 5 1/4 swr-10d4

alpine v60

12.5 VGA flip down

Nettop pc w/10" touch screen

78nova

5-re audio 5x7 ,10" sub &

Xtx-500.5

"Take the faceplate off get the jumperpack"

A preamplifier - assuming it's a low level signal. Though I am a bit confused - audio boosting for a screen flicker? Is the flicker from noise (weak shielding or GND issues)? And I would have expected no boosting required for the audio split - but that depends on relative impedances. Love the irony - an analog booster for "going digital". Get digital inputs instead...

No let me explain. The car pc has a cord thats 3ft long that goes from the pc to the screen and when I was bench testing it outside the car I extended the three get cable to a 15ft it flickered. So my solution to the problem is take my head unit out the car replace it with the car pc but my question is how do I boost that signal from my pc to my 3amps so I can have a cLean clear signal1993 sdv

Alpine 4x6 6x9 5 1/4 swr-10d4

alpine v60

12.5 VGA flip down

Nettop pc w/10" touch screen

78nova

5-re audio 5x7 ,10" sub &

Xtx-500.5

"Take the faceplate off get the jumperpack"