I previously posted and, I think, I tried all the suggestions and watched the video.
I tried a new outlet for the power cord and got a green light at point of connection, as before. also tried power cord from another compter, which fit - same result
I removed and replaced memory cards
I removed and replaced hard drive
I tried the F10 button but there is no response to the keyboard - correctly paired - the screen is black with no indication of life.
I removed the power cord and reinserted and tried the power button(holding down for 5 seconds), no response except one blue blink to the left of
the button.
I hear no sounds of any kind from the computer or see any lights.
I vacuumed the slots, but didn't see much dust.
The computer was working fine and just died when we tried to start it.
Dead? What can I do.