HP Pavilion a1123c - will not power on after being unplugged while in use

So bit of panic:
I've been using the above computer since 2007 with the expected wear and tear, slowing down. Today it was put through its paces and while on a multimedia-hwavy web page it became unresponsive to the point I could not even bring up the task manager to restart. Being a computer noob, I unplugged the computer to force a reset. It now will not power on with or without the power source. While plugged in the LED flashes rapidly. When unplugged the LED flashes but more slowly. I have tried flipping the voltage switch on the back but still my computer won't turn on.
I have all of my digital photos on this computer and am terrified of losing everything. What should I do? Is there hope of the data being salvageable? Thank you all so much.

Assuming erico 's advice fixes the situation, please make backups of the important data - such as photos or other important documents to a DVD or flash drive or external hard drive.
If the power supply troubleshooting guide does not fix the problem, there are ways to still make the backups of that important data, on a working computer from the failed computer. Just come back with the report on whether the advice from erico worked or not.
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HP Pavilion a1123c - will not power on after being unplugged while in use

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