Thinkpad W541 Turns on and off

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Hello,my Lenovo W541 has been strange recently. Its night at the time of writingthis, the laptop worked perfectly fine this morning. Here’s what’s happening: Iturn on my computer and it sits black for like 6 seconds, then the Thinkpadlogo and Press ENTER to go into bios screen comes up. Then it attempts to bootinto Windows and shuts off. It seems like a timed reaction because I’ve triedbooting into the bios to access recovery options, I goto recover system, thescreen pops up for like 5 seconds until the whole computer turns off again.I’ve tried a full hard reset, testing the power supply, and taking out andreinstalling the RAM. I’m almost sure it’s not the operating system.