If you unplug the unit wait 30 seconds and plug it back in then try to start it does it start blinking immediately or does it start to boot?
Does it give you any Beeps?
Let us know
has the machine been in the same place or have you moed it prior to trying it?
If you have movd it it is possible you may have dislodged the memory or one of the cards in the case, SO if you feel confident you could try making sure it is off and opening the case.
Then just give the memory and any cards a firm push to make sue everything is seated correctly on the motheboard.
Let me know wht happens.
Did you check to make sure everything else is plugged in correctly?
Hard drives, Cards etc?
Also could you elaborte on "I moved it when I thought it was fixed"Thanks
No the memory only goes in one way,
So you took it apart when yu had this issue start. Is that correct?
If so prior to that had you done anything or had any other issues?
By the sounds of things your machine may have gone into a suspend mode and is refusing to come out of it.
Could you try taking out the CMOS battery with the machine unplugged(bottom of the MotherBoard looks like a big wtch battery) and then wait 30 second and put it back in, Then try to repower the machine.
Let me know if it still blinks, Also could you describe the blink(1 per second 1 evry 2 seconds etc.)
When you power up the machine does the keyboard numlock ,Caps lock or scroll lock lights blink?
In that case I am sorry to say that it sounds very much like the power supply has died.
Compaq/Hp have a series of diagnostic lights built into the system and yours do not comply to any they have listed , Here is an example of them http://h10025.www1.hp.com/ewfrf-JAVA/Doc/pdf/c00000813.pdf
Usually if the code is not listed and you get a blinking green then it means the PSU has become damaged.
If you would like me to opt out so someone else can try to answer just let me know