Computer Starting, but no display/keyboard/mouse, but work after CMOS clear

I have an MSI Z77A-G45 motherboard, intel i5-3570K CPU, 16 GB of ram, a Sapphire Radeon HD 7850 GPU, XFX PRO650W Core Edition PSU, and am using a 550 VA UPS.
My computer powers up with no posts, all CPU indicator lights are lit, and the display, mouse, and keyboard get no signal, but when I read some posts about solving this problem I cleared my CMOS with the button on the back, and when the computer powers back up signal is sent to my monitor, mouse and keyboard, but upon continuing or running setup the previous behavior continues.
Help would be appreciated!

I ain't really be able to help you. The only two things i could think of are an empty battery or a faulty board. But for that matter wait for others to answer your post.
But what you are describing sounds like what i experienced five years ago, when i set up a new system with a MSI P35 Neo3-F. I fortunatly bought board, cpu and RAM from the same vendor. Same as you i had to reset CMOS in order to do anything useful with that computer. I think i had to reset everytime i turned on the pc, but not for reboots. Althoug i'm not sure about that.
Besides that i had occasional failures in Windows which is why i did run MemTest86+ from CD. I got some faulty memory addresses in that run and thought the RAM were to blame, but in further passes of memtest i got different addresses. This i mailed to the vendor and i told him, that i'd had no means of figuring out, if the board, the cpu or the RAM was faulty. They told me to send in those three to figure it out themselfs and to give a replacement for the broken one, which turned out to be the mainboard.
After that i still got failures - can't remember what failures - and could make out that the cpu wasn't working correctly. I still believe the broken board did some damage to the cpu sometime i tried to start the PC without resetting the CMOS while maybe having random values in CMOS.
I cannot say that this is fact, but for the vendor it was reasonable enough to also replace the cpu and since then i'm quite cautious when it's about a board that might be trying with random CMOS content.
I don't want to frighten you. I just want to say don't try to much without resetting the CMOS as long as it needs to be resetted all the time.
At least til someone can ensure, that my interpretation of my experience must be wrong.
Greetings,
Micha.

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Welcome and Thank you for posting your query on HP Support Forum
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Computer Starting, but no display/keyboard/mouse, but work after CMOS clear

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