Dell D630 Overheating CPU GPU Problem

System Specs:

Dell D630
Current Processor, Intel Core 2 Duo T9300 2.50GHZ
Ram, 4GB DDR2
OS, Microsoft Windows XP Professional SP3
Graphics, Intel GMA
Temperature Software, HWiNFO32


I upgraded the dell D630 laptop from the t8100 processor to the t9300 processor. I cleaned of the old thermal pad grease using rubbing alcohol and then I used Arctic silver 5 by putting a pea-sized dot in the middle and then by mounting the heat sink it spreads the thermal grease over the processor. (I did this yesterday 25 November)

Its quite cold in my room at the time of posting this

The average idle temperature for the CPU while in use for about 5 minutes is 45 – 50 degrees centigrade, lots of activity is known to rise it to 65 degrees centigrade

I have noticed while feeling the laptop underneath, that the processor area, the video area and also the middle of the LCD monitor gets hot. As it warms up I noticed that there is a horizontal line near the bottom of the LCD screen showing some sort of after images underneath, it shows regardless of whether I am in windows or on the BIOS/Boot-up screens and this stays until I switch it off and leave it to cool down for a few hours, I think that the heat must be responsible for the horizontal line. While connecting the laptop to the other LCD TV I don’t see the horizontal line at all its only on the laptops screen.

The GPU temperature rises from about 35 – 47 degrees centigrade before showing those horizontal lines

The auxiliary temperature shows about the same temperature as the GPU

I also noticed that the laptop warms up even more if I connect it to a charger

Is there anyway to lower the laptops temperature so the horizontal line will stop appearing on the laptops monitor?

Thanks for your help