On page 47 it states F2 is used to get into the bios, press repeatedly while booting so you don't miss the window, and of course check you keyboard, it should flash the caps,num, and scroll lock lights on boot.
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I see that you need to change the Boot Sequence on you Thinkcentre M55e but could not get in BIOS right.
to be able to change Boot sequence you can also try on tapping f12 as soon as you power the machine ON untill you get the Boot Menu you can also change boot sequence from there.
To get in the BIOS on a desktop you need to keep on tapping F1 as soon as you power the computer ON, but if still this does not work you can try Tapping on the Delete key to get in the BIOS, getting in the BIOS depends on the motherboard some use f1 to get in the BIOS some use Delete to get in the BIOS on desktops.
but using the F12 key can be done as well if the F1 or Delete key does not work.
there should be a boot menu command at start up just like you entered the system bios, i believe the e machine boot command is F12 that will give you the opportunity to boot from what ever you want on that boot only. so in your case of course you would scroll down to cd and hit enter. press any key to boot hit any key and boot.
You have to change the boot order at the bios settings. Just after the screen comes up, before windows start up press (repeatly) the F2 key (depending on the model, maybe F1 or del key) and go to the boot sequence. Here change the boot order as you wish.
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Apparently, the error of your system is missing operating system, this could caused by many things, from broken hard disk to missing boot record such as MBR.
First, try to fix your BIOS start up setting. Depend on your BIOS setting, go to your BIOS by pressing F1 or F2 (apparently this is your key) or END during boot time. Then go to Boot Setting (this name is vary in any BIOS manufacture, so try to locate the similar name). Change the boot priority with first priority is your hard drive,
If you still don't able to boot, this can be caused by missing boot record such as MBR. This is little bit trickier. The fastest way (I assume you use Windows), is to insert your Windows installation CD/DVD then boot from there (by changing boot priority again from BIOS, or some new BIOS support pressing F12 to choose boot device). After you boot from there, repair your Windows.
I hope this information will be helpful. Thank you for using FixYa!