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Disconnect the UPS from your configuration,
and connect the AC power directly to a wall outlet.
Press the ON/OFF button and release it.
If nothing happens, press and hold the ON/OFF button for 10 seconds, until the computer turns itself completely off.
Then, press the ON/OFF button, to restart the computer.
Have you tried going into control panel in the start button menu, then go into power options & in advanced setting's you can change all the sleep hibernate time's and button settings.
If not then you can go through the bios menu (carefully) pressing del or F2 whatever, sift through & don't change anything apart from sleep setting's, but if the PC has only just started doing this you probably won't be able to correct it there.
I would state though I think the power unit is overheating which make's the light flash as a warning, probably due to the upgrades.are you sure it's not the power supply fan on high?
if not it might disagree with the graphic's card!
Anyway hope this helped !
It seems like you have bad MOBO. I recently ordered all the stuff to build 2 new systems. Built the first one, no power, just like yours. Moved everything to the 2nd MOBO, everything worked. I did a RMA on the DOA MOBO. Got the new one and it fired right up. Sometimes you just get bad stuff.
So if i'm getting this correctly your computer will not boot even with just the basics. Have you tried directly shorting the pins on the mobo instead of using the power button? Unlikely problem but it would be an easy fix. You might also want to take your power supply out and get it tested. The geek squad at best buy will usually do that for free, or you can buy your own tester, or buy a cheap power supply. If both the switch and power supply are good and you get nothing trying to start it up it means you probably have a bad mobo. If your memory or cpu was bad and nothing else it would still boot up just without anything on the screen and might give you a series of beeps. Well I hope i've helped and that you can get this fixed soon.
Did you have onboard video before? What is the video card? AGP8x, AGP4x, PCIe?
If you had onboard video, you'll need to change the settings in the BIOS and disable the onboard video. You'll have to plug in at the onboard to access the BIOS.