Have I killed my laptop?

Hum well I think I just killed my lappy I cleaned it all up even tried a a better i5 in in but power on and the opto clunks clunks and the fan runs slow for a bit then races up to fast then stops altogether.
So thinking it might be just the new core being a dud stuck the original one back in - same result so don't know where to start even looking?

There is no screen at all and I have checked and rechecked now several times carefully following the dissemble info

Any ideas anyone?

Have you tried resetting the BIOS? Anytime you change a processor you need to reinitialize the 'CMOS' checksum.

Laptops present a special challenge in that they do not offer a CLRTC jumper.
But you can try:

• PC off
• Remove battery and power supply
• Remove 3v battery on the motherboard
• Press and hold power button for 20 seconds or so
• Replace all and boot

See if that changes anything

Ok will check for forgotten leads then move on from there. The battery os soldered in and I am pretty sure the CPU socket was clear but I will check I have the original CPU back in although I think the board supports then other one if I can get it going again might just leave it out.

It was just the beckoning of a better turbo speed that prompted me really as the 430M was only 0.26 behind in GHz to start with.

Ok machine running again I dissembled it right back to checking the pins on the core - none bent or damaged no debris so redone the thermal slipped a different stick of RAM in it left out the opto drive and put it all back together again making absolutely sure of the connections - well up to where I could switch it on and low and behold it fired up as usual.

I put back all the old RAM - I have 8GB in it - I know another overkill person - fired up again and back to it's old self. Now I am going to wait until I can afford one of those 3rd gen Intel machines before I try going faster again. Thats going to take a while "Big Bad Betty" is taking shape so is demanding most of my time now LOL!!

Now I didn't think about the change in BIOS TV as well I had no screen to do it anyway - but point taken thank you.

Plus thanks to all for the help you are indeed a great bunch of fellows to work with as always

Meant to add if nothing else I have knocked off nearly 10C form the running temp so alls well down under