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I don't have my windows disks because our computers come directly from Lenovo with a company disk image.

Also we have a disk image that installs when we boot a blank computer on our network.

What the best way to wipe a computer without any disks, so I can re-image it?

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    well, you can't reimage a machine with no disks, so I'm going to assume you are refering to a system with disks that have no file systems upon them. in that case, I'd recommend you use DBAN to wipe the disks before imaging. dban.org Jul 29, 2014 at 18:23
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    This sounds like a corporate computer. In that case, this is off topic. I'd suggest talking to your IT department.
    – CharlieRB
    Jul 29, 2014 at 18:35
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    It really depends on your imaging software, but you shouldn't have to 'wipe' anything before imaging, since you are going to overwrite it with your new image.
    – Adam
    Jul 29, 2014 at 18:38

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This image that installs when you bring a blank computer up on the network sounds like a PXE boot. If that's the case, then the imaging software that boots is likely WDS/MDT or SCCM.

In the BIOS of your computer, set the network as your first boot device (or you can option+boot, but the key you use is different for every PC manufacturer).

Once you've booted to the network, there should some kind of dialog that pops up to begin the imaging process -- either a confirmation or a screen to enter your network password. At that point, you can press either F8 or Shift+F10 to get a command prompt window.

From the command prompt, enter the following commands:

diskpart

select disk 0

clean all

That will zero out the whole drive. Note that it could take an hour or more depending on the size and speed of the hard drive, and you will get no progress bar of any kind. Just a notice when the process completes.

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