I have brought a desktop that has no memory installed.
I have checked the manuals for five-beep pre-post error lookup.
Here's what I've done so far.
I have replaced the CMOS battery with a fresh new one prior to resetting the BIOS.
I am awaiting an online order via delivery with HP brand memory modules DDR3 pc3-8500 after a third party - kingston - brand failed to operate. If nothing else works, then the system board would need to be replaced.
In addition, I have already ordered a video graphics card, but I am not sure that it would solve the five-beep problem.