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2I am surprised it would run for 30 minutes without proper thermal paste. Reinstall the CPU with proper thermal paste and test again.– anonCommented Aug 1, 2020 at 12:40
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To make things simpler, you can unplug your hard drive, and optical drive. . A computer can start and stay on without them. And of course don't need an optical drive connected. Also your title says you changed MBRD and Processor, but doesn't mention if you change the PSU. The "green-black wire shorting" method is perhaps not a sufficient test for PSU, if it passes it just means the PSU isn't completely dead but is possible PSU may be funny.– barlopCommented Aug 1, 2020 at 13:02
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If it had only turned on for a few seconds then off, then (reminds me of some years back when another cable needed to plug in there).. But for your case that's not it.. Your case it runs for 25min then turns off, and then perhaps doesn't turn on... If you wait half an hour does it turn on? If so, it could be an overheading issue. If it doesn't boot at all then maybe a bad PSU killed the MBRD. Really you should change PSU. Also try a green-black test for eg 1hr.see if it stays on for 1hr.(albeit with no load)– barlopCommented Aug 1, 2020 at 13:10
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If you're not using thermal paste, it's possible you killed the CPUs with overheating, not all CPUs will thermal throttle to protect themselves. Try the CPUs on a different motherboard if possible.– KraigolasCommented Aug 1, 2020 at 13:37
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@John I have been using this PC without thermal paste since 1-2 year. Only after this incident, PC won't boot. Also, thermal paste ensures better heat transfer, but if the CPU isn't even processing and starting, what's the use of paste? I might be wrong but PC's do boot w/o paste. In my case, it is not even booting– Rajat KhanduriCommented Aug 1, 2020 at 15:13
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