Upgraded CPU, GPU no longer showing up

[Dimpol]

Hello everyone,
I have an old, crappy laptop lying around and when I came over a cheap compatible upgrade for the CPU I decided to give it some extra life. The original CPU was a Pentium P6200 and I replaced it with a Intel Core i5-560M. The problem is that after that, the external GPU (ATI Radeon Mobility) stopped working and even showing up in the device manager, leaving only the CPU's internal GPU. Installing the drivers again didn't do anything since the card can't even be detected. I also tried a clean re-install of windows, just in case, but that didn't do anything.

When I put the old CPU back in the GPU appears to be working properly again.

The laptop is pretty old, a Pegatron built model from a few years back.
Mainboard is the H36QR model (Intel HM55 chipset / Havendale/Clarkdale Host Bridge)
BIOS is listed as: American Megatrends version 201 (Date 11/19/2010)

I read that perhaps the BIOS should be updated but the manufacturer doesn't provide a BIOS updater and I have no idea how to get the correct version. The two CPUs came out more or less at the same time though so it shouldn't be an issue really, right?

Any ideas on what could be the issue? Thank you very much for any help!

 

[hang-the-9]

If you boot the system with the new CPU in, can you see an option in the BIOS to turn on or off video cards? If not, without a BIOS update from the vendor that would enable that CPU to work, I doubt you can do anything.

When you say you found a "compatible upgrade" do you mean that CPU was on the list of usable CPUs on the support page for the laptop vendor or just that the CPU fit in the motherboard?

About the CPU working because they were out about the same time does not matter, laptops are not like desktops, they are made for pretty specific specs and options. Changing things around is not often easy with laptops.