Open this web page and find the user manual of this model.
Monitor shows - No Display and turn off. 
Power off your computer while in a power saving mode by holding the power button down for 3 to 5 seconds. Step 1: Turn your system on and off three times, and in the third attempt, the system will boot Thinkpad, Black screen, all controls frozen, can’t turn off. Id strip it down to just the CPU\HSF mobo and speaker, if you get the single beep add a different vidcard and try for BIOS. Remove new internal hardware and start your computer. Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer This article is a guide to identifying and resolving start-up / power issues with your Dell PC. Ive put it all together and it turns on, seems If the computer sounds like it's turning on but you don't see anything on the screen, the computer may be booting and the monitor just isn't showing an image. I figured out that was because I didn't have the 8-pin CPU power installed, and my motherboard only has a 4-pin, but found the 4-pin should work just fine as long as I don't push the CPU too hard. After this, I had no luck of the PC wanting to magically work again. I replaced the PSU, CPU, and motherboard, and get the same results, so those can't be the problem. Ok so here is what’s going on: a while ago i found an old computer in my attic. Pc turns on but no display or beeps reddit
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