how do i fix the issue of a mac mini a1176 not booting up, i had powered it off for 2days but now it only keeps loading on start up.please help

There is a possibility the clock battery on the logic board may have finally gone dead.

They require replacement once they do, and their failure can result in startup issues.

•Mac Mini - Model A1176 Repair Guide - iFixit:

https://www.ifixit.com/Device/Mac_Mini_Model_A1176

{If you have a startup disc, the DVD with original OS X for that computer, you could try

and start using it as a source, then see if Disk Utility can help diagnose, test, or fix it.

Sometimes a failed hard disk drive can also be part of a startup problem. Could be an

error has occurred in the system startup section of the hard drive; or the drive itself

may have a damaged sector. An old HDD may need to be replaced if the booted DVD

version of Disk Utility cannot repair it. The Snow Leopard dvd should be OK for this.}

To open and replace the battery requires knowledge and careful action so as to not

damage wires and delicate components in the way; skill, tools & attention to detail.

And have the correct battery on hand, from a reputable source, that is not too old.

https://www.ifixit.com/Guide/Mac+mini+Model+A1176+PRAM+Battery+Replacement/1114

The situation requires troubleshooting, most of the basics and lesser known causes.

You may end up visiting an Apple authorized independent service agent whose ability

to test & repair increasingly old vintage or obsolete computers and older OS, may be

helpful. There is a matter of age, a cut-off, when Apple Store genius staff cannot or

will not be able to help with a failed computer. Experience helps, in troubleshooting.

Good luck & happy computing! 🙂

You could try the NVRAM (PRAM) reset to see if that helps...

•How to Reset NVRAM/PRAM on your Mac - Apple Support:

• How to Reset NVRAM on your Mac - Apple Support

And then there is Safe Mode or safe boot:

• Try safe mode if your Mac doesn't finish starting up - Apple Support

Not sure if you could get the unit to respond to an SMC reset

and certain different rules apply to the Mini, than other Macs.

• Resetting the System Management Controller (SMC) - Apple Support:

• Resetting the System Management Controller (SMC) on your Mac - Apple Support

{I've noticed with increasing frequency an issue whereby my posted

replies in these ASC discussions do not appear; I find evidence they

have by looking elsewhere, but cannot force them to appear. Some

other users had occasionally posted a dot or a single item, and then

the original missing reply would appear. This is a test + more info.}

PS: now I see both; so hopefully you can see them now, too...?

And the URLs have turned into full blue click-on titles to the page.

In any event, good luck in this matter! 🙂