You may have more problems than just he power supply from when the old power supply went out. The mainboard could be bad.
Make sure it's unplugged from power from the wall, then check that the memory is seated correctly. Check for anything else that may be out of place or not fully connected.
There are also different beep codes for different errors. They've mostly been standardized, but may vary by mainboard as well. Here's a link to common POST beep codes and their meanings:
Computer POST and beep codes
SOURCE: Acer Aspire T690 startup problem
MEMORY PROBLEMS Hi, FOR LONG BEEPS, ONE SHORT BEEP IN AN ENDLESS LOOP, BLUE SCREEN OF DEATH AT STARTUP Try using Memtest 86+ http://www.memtest86.com/ to diagnose your memory problem. You can also try the following methods. Turn off power, Unplug. Remove the cover of your PC. Remove the memory from the Motherboard. Note on the locks! Clean the memory contacts with an eraser yes that's right a rubber Pencil eraser. It should be shiny gold. Reseat your memory to the motherboard and Test! ====================== If you are having trouble with Newly bought items save your self from headaches by returning them and demand a replacement or a refund! You may have purchased a reconditioned\repaired\factory defect product.
SOURCE: computer wont boot hear one beep from motherboard over and over
Looks like you got a power surge. Did you have it plug in on a power surge? It might sound like one long beep but really it could be many beeps. It beeps really quick. If you listen carefully you can count the beeps. Repost it here again how many beeps you got. Right now I'm thinking your motherboard or your cpu is broken
SOURCE: ACER Aspire- beeping sound - 6seconds when I power machine on
The beeps are telling you there is a hardware failure (POST). The number and length of beeps will give a better indication as to what has failed. Write back with that info and someone on this web site will interpret this for you.
SOURCE: Get NO SIGNAL on Acer M1640~Monitor is Fine~Is CPU
Try removing the system memory and clean the brass contacts and the slots it goes into, then reseat the memory and try to boot again, the memory looks like this >>>>>>>
Good luck
SOURCE: Acer Aspire M1100 desktop will not boot or respond
sounds like a motherboard or HD problem, If you can try the HD in a different pc to see if it can be recognize, also don't forget to setup you pc to boot the HD first.
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