No, you can't upgrade the CPU on this laptop.
No, you can't upgrade the CPU on this laptop.
You're dealing with a compatibility challenge. Your Toshiba Satellite L25-S1192 runs Windows XP Pro 32-bit on a Celeron M processor, while your iMac uses Core 2 Duo 1.83 GHz. Swapping the devices and reassembling doesn't work. If everything seems connected but it still won't power up, you likely need to upgrade to a compatible system or consider a different approach.
Usually the socket remains unchanged, but there are several other aspects to verify first. Is the BIOS on your computer receiving updates for the new CPU? (If the device includes the CPU you're upgrading to in later models, it should.) Is the new processor fully compatible? Can the cooling system and VRMs handle the new chip? Does the chipset accommodate the specified CPU? This is especially crucial for C2D and C2Q devices.
compatibility for CPUs in that era is really messy, you should tell us the full model names of both CPUs.
It seems the BIOS might be outdated. I wonder if updating it could help. When I received it, the date was recorded as March 2005.