HO a6600F desktop, changed power supply, only booting up to blue HP screen.has a

Changed power supply on HP a6600f desktop. Now ill only boot to blue HP screen with four options. Cannot access anything
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  1. Welcome to Tom's Hardware Forums!

    Is the new PSU a good working PSU? If so, check the 24-pins connector and the 4-pins/8-pins connector and make sure that these are mated well and the latches engaged. Check RAM too.
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