No POST. No Beeps. CPU Overheating Almost Instantly.

JoeStk

Reputable
Dec 7, 2015
3
0
4,510
Sup beautiful people,

I work as a 1st Line IT Support Technician and one of the schools I have a support contract with let me take an old laptop to fix up for a friend studying at university. This is a Toshiba Satellite Pro L300. So far I have added 4GB DDR2 SODIMM and an SSD and installed Windows 7 64bit.

The processor is an old Intel Core 2 single core processor for the PGA478 socket. It is pretty poor at multitasking so I thought I would buy an Intel Core 2 Quad Q9000 which is also for the PGA478 socket. However I don't seem to have much luck getting it to work. I bought this off eBay for something like £27 and they have a 7 day limit for first contact about a refund/return so hopefully I might get some insight on this before then. I didn't expect much from eBay though it would be nice if it did work.

With this "new" CPU it doesn't post, there are no beeps and the fan just spins what I would assume would be at max RPM. I also noticed the CPU get's extremely hot almost instantly which strikes me to be quite odd for an old CPU. Probably takes about 1-2 seconds after turning on the power for it to get so hot it would leave burn marks on my finger by very lightly touching it (then flinching). My i5 4670k does not get that hot that quick like that at all and Haswell is supposed to be a "hot" generation of CPUs.

I have inspected the CPU itself as well as the socket and can see nothing obstructing or shorting anything. I can't clear the CMOS, the battery is like fixed to the motherboard and I would rather not have to resolder anything. I cannot see any jumper pins either which is not uncommon on laptops.

Toshiba Satellite Pro L300
4GB DDR2 SODIMM
PGA478 Intel socket
Working CPU upgraded to Intel Core 2 Quad Q9000.


Any help appreciated, thanks.
 

Barty1884

Retired Moderator
Sounds like either the heatsink isn't in place correctly/lack/excessive thermal paste, or the new CPU isn't supported.
1. Did you fully secure the heatsink? Should be 4 screws that hold it firmly with the CPU
2. Did you replace the thermal pad? Replace with paste?
3. Are the copper pipes cracked?
4. While it's the same socket, the laptop may or may not have had a BIOS update to support it (laptops rarely get newer CPU support).
 

JoeStk

Reputable
Dec 7, 2015
3
0
4,510


1. Heatsink fully secured.
2. Thermal paste replaced.
3. Copper pipes not cracked.
4. I have updated to the latest BIOS before swapping the CPU, though no support is a possibility. I will check to see what the BIOS is and maybe there will be some documentation online.
 

Barty1884

Retired Moderator
Laptop manufacturers rarely post the supported CPUs.....unfortunately it's a lot of trial & error. Firmware/BIOS limitations tend to restrict what you can use, despite being the same socket - sometimes it makes sense, as cooling is not designed for higher thermal output etc, sometimes it makes absolutely zero sense.

Other than trial & error, you can look to other models using the same BIOS/socket from Toshiba and see what CPUs they shipped with - it may give you an idea of supported chips. I doubt you'll be able to upgrade beyond what the BIOS supported for the highest tier model at stock.

From what you've described, considering there's adequate paste, no damage & a secure cooler - I suspect you are dealing with an unsupported chip.

Good luck though!