I'm sure you've seen those USB boxes that let you plug in a 1/4 inch jack, here's one you can make for £1!
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Step 1: What You Will Need
For this, you will need
A 1/4 jack for your guitar, or any other jack you want
A drill and appropriate bit
An analogue computer sound cable (mine was from an old CD drive)
Step 2: Disassemble
Take the cover off of your computer, ensuring it is all un-plugged. Remove the two rear screws and then it should just slide off.
Step 3: Prepare Cover
Pop out a bay cover then drill a hole in it the size of your jack's thread.
Step 4: Sound Card
Find the AUX on your sound card. There may also be a aux on your motherboard, have a look around.
Step 5: Prepare the Jack
Solder one end of the cable to the jack.
The thicker one or outer wiring will be ground, and the two smaller ones left and right.
My jack was only mono, so I wired the left and right wires together.
Step 6: FIt the Jack
Push the jack into the hole and tighten. Thread the cables through the case to the AUX connector.
Step 7: Connect
Connect the other end of the cable to your AUX port.
Step 8: Reassemble
Put the sound card back in, and replace the cover. You should now be able to use your jack as a line in. If not, try adjusting aux or line in volume in sound properties and double checking where the jack is connected.