SC440 Power Issues, Orange Blinking Power Button

Hello All,

I recently purchased a used SC440, that was in working condition for a Non-Profit Christian Group in Uganda. I am currently volunteering with this group and would appreciate any help that might come to mind. Here's what happened: I brought the unit into the office and as I was setting up I forgot to set the PSU for 220v, as I plugged it in the PSU blew (sounded like a gun). I had a visitor bring over a PSU, for a GX280, similar power requirements just different plugs. The original PSU is a H305P-01 and the replacement was H305P-06. After installing the PSU, the computer booted to windows login and then suddenly shut off resulting with a orange blinking power light. After a few attempts (no change in input or output devices), the computer stabilized and proceeded to work for about 6 days. Also, when the unit unexpectedly shuts down, I have to power cycle the PSU in order for the unit to attempt to reboot. If I hold down the power button (5 secs) to turn it off and proceed to power it back on it just blinks orange and never gets to diagnostic lights. Afterward the same problem began to occur.I downloaded Dell Online Diag and all tests passed without issues.

Here are some known issues about our office. Working here in Uganda, Africa we tend to have low to high voltage that is not as stable or consistent as we like.

Any ideas? Could something else other than the PSU be damaged from the 110/220v mistake? Or should I consider getting a voltage stabilizer? How might I trouble shoot the new PSU, and or maybe the mainboard? (All Diagnostic lights are green and no issues at boot)