Lenovo T430 won't boot after CPU upgrade?

(Specs under the text)
I upgraded my Thinkpad T430 from an i5 3320M (35W) to an i7 3610QM (45W) yesterday. According to several forums and reddit, this should be possible without any problems. After the change, however, the laptop doesn't even get into the POST, the fans come on and go out again after two seconds. Maybe you have a solution ready.

Specs:
1600x900 matt LCD
i5-3320M (35W) (without dGPU)
Toshiba fan with iGPU heatsink version
Original Lenovo 65 and 90 W AC adapter (20V)
2x 4GB DDR3 Crucial PC3L-12800 SODIMM
BIOS ver.: 2.75

What I've done so far:
CMOS clear
All possible RAM configs tested
65W and 90W adapters tested
Deactivate CPU power management, Intel speed stepping, hyper threading, turbo boost

Try it with the old processor, maybe the PC is not designed for it, or there are still a few wrong settings in the BIOS / UEFI…

Otherwise Windows has to be set up again after hardware replacement, because it is not calibrated to the newer components!

Try again with the old CPU

If possible, look for settings in the BIOS that may be wrong

Or you have to suspend Windows

Because the old drivers are still on it

A question of what frequency is your ram

I found something here in a forum, hope it helps you somehow

https://thinkpad-forum.de/threads/212892-T-430-CPU-tauschen-von-I5-auf-I7-3630qm

Keep your eyes and ears open for you

Does it still run with the original cpu?

The old cpu has max ddr3 1333 the new ddr3 1600

so you can do both

Yes, without problems. I have already read through the Forum Post. But I have the QM77 Express chipset with which the i7 should actually run. Would reset the BIOS and uninstall all drivers from i5 and connect an external display. Maybe that's the way it is.

Sorry for the late reply, colleague - I still had the same Thinkpad flying around, I tested it right away. The same error occurs for me, but disappears when I completely reset the BIOS. If I use the original CPU, I still have to perform a reset.

So i7 in and then reset BIOS?

So i7 in> remove CMOS battery> wait> connect CMOS battery> start?

Yes, that should be correct.

I tested it, no signs of life. So far I have everything through. I will contact the dealer and send the CPU back if necessary.

Update: I sent the old CPU back and got a new CPU and it runs without problems. Temperatures are in the yellow area with 100% load on all cores, but everything runs without problems. Windows has accepted the CPU after a bit of grumbling. Conclusion: It was the CPU.

Update: I sent the old CPU back and got a new CPU and it runs without problems. Temperatures are in the yellow area with 100% load on all cores, but everything runs without problems. Windows has accepted the CPU after a bit of grumbling. Conclusion: It was the CPU.

CPU defective, we haven't had that often 5 times in 20 years…

GSD, the brooding has an end:-)