Aspire 5742z-4601 Problems

I replaced a motherboard in my friends laptop that was constantly shutting down. I replaced the cpu, put t/p compound on it, put it back together, fired it up, it lasted 10 minutes and shut right off. I have it on a note book cooler under it, the fan is running good, its all clean, i went in to the power options and reduced the cpu usage to %90, and it still shuts down.. If I could keep it running long enough to run a malware scan I would, is it possible the o.s. is corrupt and this is causing it? No BSOD at all, just shuts down.. Any Idea's, please help?

p.s. the motherboard is brand new (oem)

tx Mac

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philetus

What happened to the old Motherboard?

heymac

Apparently the same problem. He took it to a repair shop and he was told it was a chip overheating causing it to shut down. The price he was told to repair or replace was too much, so he asked me if I could replace it for him. I checked the battery,power adapter both individualy, the fan is working good. I discharged it and it still shuts down. I noticed it has 2 different mem chips, so I'm going to test and pull one separately to test that. I thought it was unusual to see 2 different brands of memory, but the same speed. I have been tinkering for years and this one has me stumped. Usually a cpu works or doesn't, I tried safe mode and it does the same thing, so this is why I'm leaning towards reformatting. Any help is appreciated!