Try this...

You will need :

2 face cords of wood (mix of oak and pine)

1 live chicken

1 tub of woad (make from scratch if you prefer)

1 cast iron cauldron

1 cleaver

1 gallon of mead (4 horns worth)

5 sticks of cinnamon

1 drinking horn

Start by buiding a small fire with the wood and heating the mead in the cauldron over low heat with cinnamon sticks.

Once mead is warm remove from heat and consume 1 drinking horn worth while throwing the remaining wood onto the fire.

As the bonfire reaches it's highest intensity secure the chicken and the cleaver. Consume second horn of mead.

Approach the recalcitrant computer witht he chicken in the left hand and the cleaver in the right. Slash chicken's throat coating computer liberally with warm lifeblood. Consume third horn.

Attempt to boot computer. If it doesn't boot up consume fourth horn of mead, disrobe, slather your body with woad and burn down the nearest village. Worked for my ancestors anyways...