Hp 6225 Pavillion Will not fully turn on.

Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
Starter Voltage Drop
How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

There are a few ways to attempt this one is take it in to a shop they can access it with special software. Or download your own special crack software or re-install you operating system using the recovery disc that came with your laptop. Try removing the CMOS battery as well for about 10 minutes or so. Sometimes this will work Also call them they have bypass codes they use to get your through as well. My suggestion would be to call them and have them walk you through it and explain it further if your not computer swavy.

> bought this computer a couple of months ago

Then, it should be FULLY covered under WARRANTY, either from the store from where you bought it, or from ACER.

> new battery from COSTCO

It's probably 100% fine; it's your laptop that is the problem.

Exercise the WARRANTY to get the laptop repaired/replaced, at NO COST to you.

Your computer is infected. Remove the current anti-virus and install

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if your computer is still under warranty take it in if not you might have to buy a cooling dock or buy a fan and swap the old one in for anew one personally i would not do it my self if i didn't know haw to work it but take it in to a best buy and they will fix it for like twenty or thirty dollars

HP has been really great with my pavillion desktop and its out of warranty and they still help me with the issues and help me solve them it may take a while to get it taken care of you may have to emial back in forth to get your promblem taken care of. Here is the email support that you can try just provide the modle number and the serial number that should be located on one side of the computer or on the bottom of the tower, and Good Luck!
PAVILION_SUPPORT_EN@MAIL.SUPPORT.HP.COM

lubricate the shaft. if no improvement, the motor is defective.

its better take it to the technician , i think the problem is in the mother board

Might be that your monitor is starting to go bad. Try another known good working monitor on the computer. If it works properly then you know its a problem with your original monitor. If the 2nd monitor doesn't work properly then its a problem with your video card.

If your original monitor is the culprit then it could be bad caps on the main board but regardless you could possibly take it back to Best Buy and get it replaced since it should at least still be under the manufacturers warranty.

check yo RAM,Or VGA