First thing to do in these situations is to disconnect everything except video, system board, power supply, and processor. With just those components, see if it will show the boot on screen.
If so, then add devices back one at a time, checking in between each to see that it still boots. That should lead to determining what hardware is causing your problem.
If not, then you have either bad memory, processor, system board, or video. Usually bad video or memory will give you a beep code. It is also rare for a processor to die without a fan failure first. Therefore, the most likely defective part is the system board.
As for you data, provided the hard drive is not damaged, you can always place the drive in another computer (with equal or newer version of Windows) as a secondary drive and retrieve your data.
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