View Full Version : Changing laptop cpu
01-14-05, 09:24 PM
I just put in a new p4 1.6mobile celeron cpu in my laptop. The laptops turns on. It says bad cmos checksum, press f1 to enter setup. When I do so it just turns off, 1 second after it enters the bios. Could this be due to bad cpu. Or the laptop wont even boot with a bad cpu.
01-14-05, 10:40 PM
this would probably be better off in mobile computing, i don't know that much about laptops but have you looked to see if there is an updated bios? (i'm assuming laptops use bios)
01-14-05, 11:32 PM
It should support this cpu no sweat, there is a 2.8gig in there, just wanna use that desktop cpu on my desktop, no laptop.,
umm...are celeron's even mobile? so therefore u cant use them in ur lappy.
Yeah, you can get a mobile celeron. Although they are called Celeron M's I believe. The lower model of the Pentium M processor. Personally I'd flash the BIOS to a newer revision if possible. If not then I'm not sure what the problem is. If it was a bad cpu though it would probably just give you a blank screen.
I'd go back to basics, check my cooling. Might just be getting too hot and shutting down since most laptops have more temp controls than desktops? What laptop is it?
01-15-05, 09:47 AM
have you tried pulling the cmos battrery for a little bit or like he said flash the bios to a newer version or looked to even see if that cpu is even supported by your computer manufacture?
01-15-05, 10:37 AM
Yeah, put the old cpu back in, update the bios, reinstall the new cpu. That should cover bios issues or maybe fix the problem if the HSF is not making good contact as well. Those are the two things I would suspect.
01-15-05, 11:23 AM
Well thanks guys
I was thinking could be a protection thing from toshiba to protect me from changing the cpu.
01-15-05, 11:27 AM
Nah, if it powers on and can get to the bios that's a good sign. If its shutting off shortly afterward, its probably overheating.
Im with skab and arkaine, I saw my buddy have the same prob with his desktop yesterday because he never changed the thermal paste. His bios temps were almost 90C. The thing would reboot while he was in the bios and he thought it was incompadable. We took of the old thermal paste put on some new stuff and temps fell to 35C. Problem fixed.
Can you check the temps in your bios?
I'll agree with the overheating consensus too.
I had something very similar happen when I upgraded the CPU in my lappy from a P///500 to an 800. It ran a bit longer than you're getting, but acted the same. It was overheating. The old P/// puts out less heat, which is why yours is kicking off quicker than mine did.
Check the contact between your CPU and HSF. ;)
Guys, there is one thing you're not looking at.
Is that 1.6 Celeron, a Willammette based chip?
Some boards that support a Northwood CPU, won't support a Willy.
One more thing, did the old CPU have a heatspreader on it, and did the new one have the same heatspreader? Is the heatsink touching the CPU?
01-15-05, 05:43 PM
I am pretty sure the cpu is based on the northwood core. The core is not covered up, very easy to crack, so I put some small peaces on the side to protect the core. I used brandnew thermal paste,
Arctic Silver 5.
small pieces on the side? Would these small pieces prevent the heatsink from completely contacting the cpu die? and did you only put a little thermal paste on? For most cpu's it's about the size of half a grain of rice.
01-15-05, 06:26 PM
I dont think the cmos checksum error is related to it turning off. I personally think the processor is overheating, and auto-shutting down to prevent frying. I think the error is as a result of the new processor being installed without the cmos being reset.
But if it were overheating, that would mean that not even the heatsink is touching the CPU- because most laptops can remain un-fanned for at least a couple minutes before the CPU + HS gets warm enough require active cooling.
Re-check the contact between the core and the cooler.
01-15-05, 07:53 PM
I installed the cpu, and test it, within a few seconds after turn off, I touch the cpu core with my finger and its really cold. I cant get to the cmos battery, I need to open the whole laptop. On my dfi 865pe with this cpu it wont even boot.
01-15-05, 07:57 PM
Here is the cpu specc
This cpu runs at 100mhz, like any other celeron. 16x100. 100mhz is too low to boot of this dfi board, I am guessing.
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