HP Pavilion Desktop will not start up. It is a HP 754N.

 I haven't us it in a while and used it last night and it seem fine.

Aisparks, welcome to the forum.
There are two components that could be causing the problem that you are experiencing; the power supply unit (PSU) and the memory.  Here is a guide to help you troubleshoot the PSU.  It is for newer PSU's but it should help.  To test the memory, you should remove all of it from the computer and replace it one module at a time and boot.  Place the single module in the slot nearest to the processor.
Please click the "Thumbs Up+ button" if I have helped you and click "Accept as Solution" if your problem is solved.
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HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
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**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
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    DP-K
    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
    ****I don't work for HP****
    Microsoft MVP - Windows Experience

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    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
    ****I don't work for HP****
    Microsoft MVP - Windows Experience

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