Some suggestions:
1.
How Long Will You be Away from Home? if it is for a few days, stop trying to empty the trash, wait until you get home and run the
Disk Utility repairs as suggested.
Ignore the rest of this post.
If you are currently fleeing jurisdiction having burned down your home to cover up the fact you are actually Batman, then you need to protect yourself.
1.1
I Can Neither Confirm Nor Deny I Am, Actually, Batman but I Will be Home Soon but Unemptied Trash Confuses and Annoys Me:
Download the FREE
Onyx program for your system. Go to Cleaning then Trash and empty the trash. If THAT does not do it, you need to wait for better solutions which involves repairing your system.
1.2
I Will Not be Home Soon . . . Stop Persecuting Me! I AM THE NIGHT!:
Move on to
2
2.
Have You Backed Up Your Data? if you do this regularly then WHATEVER is the problem--damaged volume, dying hard-drive, upset Polynesian Rain Goddess--you can ultimately fix it without losing precious data . . . like that French Lichen Porn. If you have not and will NOT be home for some time consider buying a small, portable, external HD and
clone your hard drive. There are a couple of benefits to that. You can "boot" your Internal HD off your now cloned External HD and then run
Disk Utilities from the External HD.
Disk Utilities is a part of your system. You just cannot effectively repair a hard drive it is "on" if you are booted on that hard drive.
Should that work . . .
voila!
3.
I AM Rogue! I Am Ronin! which means you will not have access to your installation disks for some time. Backing up your system is crucial. If you cannot repair your system that way--back up, boot off back up, repair, re-back up--then you should consider an alternative--particularly
Disk Utilities FAILs to fix your problem.
3.1
Expensive: A program like
Disk Warrior. You can boot off of that, and if
DW cannot fix it--da broke! I have a
FAQ thread on that--the big upside is at the very least it can save your data. The problem is if you have volume corruption is can increase over time until--like me--suddenly you have a non-working computer. Of course, that is expensive--like ~$90.
3.2
Not So Expensive: Consider getting--if you do not have it--a downloaded version of your OS--they have practically given away
Snow Leopard--you can still get it on
Amazon for about $30. Or if your computer can handle it you can upgrade to
Lion or even
Mountain Lion. What you want is something you can "boot" off of.
SL is best, perhaps, since it is still a DVD that you can then boot off of, run
Disk Utilities, and at worse reload your System. The others require a bit more steps to create a bootable USB/disk.
Anyways, that is all of the iterations of your situation I can imagine . . . unless you are actually The Joker. . . .
--J.D.