Well, what's to say that the PC is actually off? Many "enterprise" laptops nowadays can't have their battery pulled out easily.
My HP laptop needs to have the back panel removed. If I do that, it'll trip the intrusion sensor and wipe the TPM. IT can know about this and ask you why you're taking apart the laptop. If it's windows, and you don't have the BitLocker key, you won't even be able to turn it back on.