What is making a cracking sound in the front end of my nissan when you frist move and turn wheeleather way backward or foward

Sounds like CV joint. Get both front wheels off the ground. start it up and and have someone listen for the source of the noise.

the flex pipe in the exhaust is probally broken or maybe a crack in the manifold.

For noise problem from steering wheel,click the link below :----http://technoanswers.blogspot.in/2012/02/steering-wheel-problem-on-car.html
--------This will help.Thanks.

You don't say what kind of vehicle we are talking about, but it is safe to assume your ignition switch needs to be replaced.

Change the motor of ur power seat or for cost saving, u can swap the FW & BW motors and once ur power seat is back to right position disconnect the wire to prevent the future unwanted movement.

The seat has a transmission to move the seat up, down, foward , & back. Screw jacks adjust the seat up & down. Cables move the seat forward & back. The cable it seems had to break or the end of the cable has rounded out. Possibly the cable rounded out the seat it rides in the transimission housing too. You will need to remove the seat to find out

Frist check the fuse when this happens and make sure you have power on both sides. When the problem happens do not shut off your car so the problem keeps happening and then do you checks. It sounds more like a circuit breaker is popping. if the fuse is good then check the relay under the hood and let me know what you find.

I hate to say it but it sounds like you have a severe problem in the rear end. Here are a couple of things i would do. First pull off your tires and wheels. Of course you need to put the truck on jack stands and block the wheels for safety! Disconnect your rear drive line so you know nothing from front diff or trans could be affecting it. Next spin the brake rotors by hand and inspect them for severe damage. Go forwards and backwards. Also listen in your rear end for grinding or clunking noises and also excessive play front foward to reverse. And last drain your oil and put your finger up inside the housing as far as you can and feel for large pieces that should not be there. This should give you a good idea if it is in your braking sytem your rear end or wether you need to start looking at front diff. or the trans. If all is good on rear end do the same thing for front diff and inspect it as well. Make sure you pull front driveline off!

First place to look is to make sure that when you move the shift lever, the shift arm on the transmission is also moving. If the cable between them breaks or streches, this will not happen...If you find that it dosen't move properly, change the cable!
Hope this helps...likely anything else will be much more expensive!

Go to the parts store and buy (for about $10) a mechanics stethescope.  It will have a metal piece you can carefully (MAKE SURE YOU DON"T PUT IN THE PATH OF A MOVING BELT OR FAN) put on the top of the A/C compressor, other end in your ears, and with a helper turning the A/C on and OFF,  you should be able to determine if the sound is coming from the A/C compressor clutch.  If so, replace the compress clutch or compressor.  Form the limited info I have, it sounds like the clutch is bad or on the way out.
If the A/C works (blows cooler than the ambient air), it's unlikely there is any problem with valves in high or low pressure side being in wrong position (especially if no one has been monkeying with them ;~) )