Toshiba Satellite 1415 notebook runs very slow

I spent about 4 hours trying to repair this laptop. The customer brought in Toshiba Satellite 1415 notebook with the following problem: Laptop runs very slow, sometimes locks up. When playing DVD movie, the video output is choppy and freezes up. He reloaded Windows XP from a restore CD but it didn’t help.

We see these kinds of laptops every day and this one didn’t look scary from the beginning. As I always do, I started the laptop waiting for the problem to occur. The laptop booted to Windows fine but much slower than an average unit. During the boot process I was listening for an unusual sound from the hard drive. It was a little bit loud; but nothing critical like a grinding sound. After the notebook booted to Windows, I tried to play a DVD movie and it took me more then 2 minutes to open WinDVD player software. It took one more minute to start playing a DVD movie. The video and the audio output were choppy. Replacing the DVD drive didn’t help. I was blaming the hard drive and started testing it with Hitachi Drive Fitness Test but it didn’t fail. Just in case I installed a test hard drive and reloaded the original factory software. Same problem occurred right after I rebooted the laptop. I tested the memory with Memtest 86+ test. It took me over 2.5 hours to test 512MB of memory but it didn’t fail the test. Usually this test runs much faster. Just in case, to make sure that the memory is not a culprit I swapped both memory sticks with a good known test memory but it didn’t fix the problem. After I excluded the hard drive and the memory I guessed that overheating was a problem because the laptop was running hot. If a laptop runs slow, I always check if the CPU heatsink is clogged with dust and lint. In this case cleaning up the heatsink, regreasing the CPU and reflashing the BIOS to the latest version didn’t help either. OK, I tried all easy stuff, now it’s time for hardcore. I started removing parts one by one trying to narrow down the problem. I removed the modem card, wireless card, DVD drive and left only the system board, the CPU, a good know hard drive with a fresh Windows load and a good known memory stick. The laptop still was running slow. After 4 hours I gave up. After I excluded almost every possible part, it must be a bad system board or a bad CPU. Replacing any of these parts wouldn’t make any sense because it would be more expensive than eBay price for a similar working laptop. I called to the customer and explained the situation and he just declined repair.