IndexOverflow
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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I finally got a hold of a Dell technician who was able to understand my problem. I was told to do a power cycle of the laptop: Remove the battery, remove the memory sticks and finally press the power button for a good 30 seconds. Then wait another 30 seconds before you put everything back together. 

In another words, just a full CMOS reset. But it worked! After booting the TPM options were back in "Security" in the BIOS. 

I still would really have liked to know what caused this in the first place though.

Ed_Luck
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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I was told to do a power cycle of the laptop: Remove the battery, remove the memory sticks and finally press the power button for a good 30 seconds. Then wait another 30 seconds before you put everything back together. 

In another words, just a full CMOS reset. But it worked! After booting the TPM options were back in "Security" in the BIOS.

Interesting.  I'd go try that right now if it wasn't for the fact I don't have a torx driver that small!

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evasec
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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BitLocker can be used without a TPM but it requires additional authentication in the form of Password (or USB key I believe)... http://www.digitalcitizen.life/how-enable-bitlocker-without-tpm-chip-windows-7-windows-8

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TomB200
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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I had this very issue as well and it happened about 4 weeks after I activated bitlocker. In my case, I had upgraded to Win 10 pro just to get bitlocker. I suspended the protection. After a few weeks of dealing with Dell, they never did resolve it but suggested that I needed a "fresh" full installation of Win 10 pro onto my computer. Before I could take them up on it, I guess because one of the updates I made, the computer came into a mode that it basically forced my into decryption. Once I decrypted, the TPM module showed back up again.

Like the other responder, it was all seemingly pretty random. At this point, I've just left it decrypted since it doesn't seem like I can count on it behaving like it should over time.

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jsmithbmn
1 Nickel

RE: XPS 15 9550 - TPM has "disappeared"

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I also talked to a Dell technician about this problem. He suggested something much more easier:

Instead of removing RAM, Battery, ... you can easily reset BIOS by removing the power plug, pressing CTRL + ESC and insert the power plug (now the laptop should start automatically). With this combination, a BIOS reset is done. Afterwards my TPM module was visible (again). Hope this helps (and I hope I remember the key combinations correctly, but this should be the case).

In this post, we shall outline how to go about choosing the best heat gun, and also review five of the best heat guns out there

I_Tichy
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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Thank you so much for this providing this answer.  If anyone else shows up with this problem, I can confirm that this is in fact a real solution.

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arnoldp2
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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Resetting BIOS with CTRL+ESC and connecting the power plug boots my laptop for about 10 seconds. Afterwards it turns off automatically. However after starting the machine, the BIOS and Windows 10 don't recognize any TPM module. The module worked for a few weeks when I bought the xps 15 9550 1,5 years ago, then it disappeared. It never worked afterwards. Tried to format the disk and installing a fresh copy of Windows 10. Nothing works.

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IndexOverflow
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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And what do you know, this problem is back. Happened out of the blue again, no BIOS update beforehand.  Tried the CTRL+ESC+Power Plug to reset CMOS this time, no luck. Could any Dell representative shed some light on *** is going on?

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g.becattini
1 Nickel

RE: XPS 15 9550 - TPM has "disappeared"

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Wow! It works!

Some extra info for dumbs like me:

1) switch the PC off

2) disconnect plug

3) keeping pressed CTRL+ESC reinsert the plug

4) a menu appears

5) select restore BIOS defaults

intrepidez
1 Copper

RE: XPS 15 9550 - TPM has "disappeared"

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I had this problem starting about two weeks ago and it was very frustrating.  This solution worked. Thanks for posting.

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