I have a 96 infiniti i30, my car is not turning over... the lightson the car will turn on but there is no sound of turning on the engine. We took the battery and starter to the auto part store and they are both good and passed... what else can possibillty be wrong with it?? Also I put a audio system in it recently, can that affect it at all...

Question edited for clarity and toss in some CAPS.

There is nothing that backs up memory. When you disconnect the battery, all memory is lost, which is why it is important not to do it!

You don't tell us the model? Is it a secret? All questions need 'year make model' as the FIRST 3 words.

If your have a 1999 Infinity I30, the ECM Fuse is Fuse 58.

58 10 Engine Control Module (ECCS), Mass Air Flow Sensor, Crankshaft Position Sensor, Idle Air Control Valve (IACV-ACC) Solenoid Valve, Ignition Coils, EGR, EGR Volume Control Valve, EVAP Control System Pressure Sensor

Infiniti i30 (A32; 1995-1999) fuses and relays

Fuse Box Diagrams https://fuse-box.info > infiniti > infiniti-i30-a32-1995-...

Fuse box diagrams (location and assignment of electrical fuses and relays) Infiniti i30 (A32; 1995, 1996, 1997, 1998, 1999).

Infiniti i30, i35 (A33; 1998-2004) fuses and relays

Fuse Box Diagrams https://fuse-box.info > infiniti > infiniti-i30-i35-a33-1...

Fuse box diagrams (location and assignment of electrical fuses and relays) Infiniti i30 / i35 (A33; 1998, 1999, 2000, 2001, 2002, 2003, 2004).

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Help in the link

P0720 2000 INFINITI I30 Code Vehicle Speed Sensor

https://www.autocodes.com > p0720_2000_infiniti_i30
Diagnostic trouble code is detected when Transmission Control Module (TCM) does not receive the proper voltage signal from the sensor. 'What are P0720 2000 ...
Missing: miss ‎' Must include: miss

More here

https://www.google.com/search?q=2000+infiniti+I30+miss+shifting+code+P0720

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Sounds like a switch issue.

electric suspension not likely on a 1996 model
std macphearson struts should be there unless your i 30 has been after market modified
power assisted rack and pinion with the pump
what does the susoension parts listing show for the i30
https://www.autohausaz.com/infiniti-auto-parts/infiniti-i30-repair_manual-replacement.html

I30 Stalling and Acceleration Problem - Infiniti Forum

infinitiforum.net > ... > Infiniti I30 / I35 Forum
Jan 18, 2011 - It is idling erratically and occasionally stalling when the car is not in motion. ... gain speed the engine bog's down and will not let you accelerate.

is the noise going overtop of even your radio? how long has it been doing this? when you turn the steering wheel right or left does it go away?
from just your above issue it sounds like a wheel bearing is going on your vehicle but would need more information to be precise.

Your timing belt or chain could be broke.
First model year for the I 30 in the US was 1996 and it used a timing chain.
Have you checked compression yet ?

2 possible solutions. 1 or more serpanteen belts are not engaging ( slipping will smoke like he'll! I burnt all 3 when I started my j30 '96 after almost 2 years! Had to charge the battery overnight..everyone really should have one! Times like that you are gladjya did! And my battery was replaced the day I stopped driving it!). Either that...clogged fuel filter. Seriously, it happened in all three j30's I have owned, and one Jaguar XJ6 with saddle back gas tanks. $55 usually to change...maybe a lil' more depending the garage hrly rates.

you need to install the battery as soon as you install the negative battery cable the alarm will sound and you will hit the unlock button on your remote that will shut off the alarm this solution will work for anyone with the same problem

stater