text: i removed my pc hard drive. now windows doesn't boot up until i hit f1 or f2. how can i resolve this issue? i now live in the uk. it is a pc purchased in the us. we removed the power supply thinking we could just swap it out. we're now running it using a step down transformer with the original power supply. any help would be appreciated. first off, most computer power supplies are dual voltage. you should see a switch on the back of the power supply. set that to 240 volts and you should be fine. why did you remove the hard drive? did you have 2 drives before? if so you will need to go into your bios and remove the second drive. outside of that, what does the error that requests you to hit f1 or f2 say exactly? without knowing why it is asking you to do that no one will know what the problem is.