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Screen blank and single beep after bios battery change

hp compaq 6000 pro all in one
Microsoft Windows 10 (64-bit)

I replaced the cios battery and put everything back together and I can't get the PC the boot up. It Powers up but the screen is blank and I get a single beep and that's it nothing happens. The power led on the front is green. I've tried taking each memory module out 1 at a time and starting it and the same thing happens. I've tried putting each memory module in each slot and still the same thing. I've tried using some canned air and blowing everything clean and checking all connections but nothing. I'm stumped

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