On power up it beeps 3 to 4 times and won't boot up

That will generally indicate a major system problem on just about any PC. On your PC it should be indicating an issue with the video subsystem. These problems are not always fatal so it might be as simple as pulling the power and battary for a full system reset or you might need to do a firmware reset. at any rate I am not an expert on Acers so hear is a link to the Acer help site with the exact error you are having and they did get it fixed. take a look.

https://community.acer.com/t5/2013-Archives/Aspire-T180-won-t-boot-and-is-making-a-beeping-noise/td-p/29389

Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.

3 BEEPS -RAM

Guest Posts: n/a 01-24-2005 We had a power failure in the office this weekend. All the systems are back
up and running fine, except for the receptionists. It's a Gateway
Professional Series. P4 1.3 Ghz. It is giving me three beeps. No boot up
screen and no video source (monitor light stays yellow instead of turning
green). I looked up the beep code and it says three beeps means the ram
needs reseated. Which I have done several times. Also, I have just put in
one stick in difference seats. I have also reseated all the cards at least
three times. I have switched the jumper to try to boot into setup mode.
Nothing there either. Popped out the cmos battery and put it back in. No
good either.

Has all the ram been fried? The fan on the cpu is still spinning. The cd-rom
ejects. I can't hear the hard drive spinning. I guess I can swap the hard
drive for a different one.

Anything I'm missing? YEP
http://support.gateway.com/s/MOTHERBD/INTEL/m00262/beepcode.shtml

3 BEEPS --RAM HAS IT HAD A POWER FAILURE AND DO YOU HAVE A SURGE PROTECTOR IS THE LIGHT STILL ON TO SAY SURGE PROTECTED

What is the pattern of the long beeps? one long beep or two long beeps, three long beeps?

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Usually three beeps indicate a problem with the RAM, reseat the RAM and then try to boot up with disk warrior. Hope this hels.

3 Beeps is usually a RAM issue. Try re-seating your RAM in their slots and rebooting.

Try booting up in safe mode. Press power on button and press F8 until you see a list appear. Go in under safe mode and see what the problem is....Hope this helps....

PULL OUT THE WIRE FOR A POWER SWITCH ON THE BOARD AND TRY TO SHORT BOTH PINS WITH A SCREWDRIVER

This problem is due to the mix of registered and unregistered DIMMs. 64Mb and 128 Mb DIMM's are unregistered memory technology 256MB is registered memory technology. A mix of registered and unregistered memory prevents the server from completing startup, and results in an error beep sequence and a blank screen