Computer not switching on

[gkm027]

When ever i switch on my computer, my ups gives a beep and switches off and again switches on and off ... . Sometimes motherboard switches on but display won't show up.

 

[1LiquidPC]

What power supply do you have? Also, how old is your UPS? A bad/dying UPS battery can cause odd problems and beep when you try to turn on a PC.

 

[gkm027]

What power supply do you have? Also, how old is your UPS? A bad/dying UPS battery can cause odd problems and beep when you try to turn on a PC.

PSU is a low grade one which I bought to run an old motherboard, and the psu is new one too. And the UPS is almost more than 4 year old and I changed the battery of it too.

 

[1LiquidPC]

Since you replaced UPS battery since it was new 4 yrs ago, I'd lean towards the low grade PSU then. Have you tried bypassing the UPS all together to see what happens. It could all be the type of PSU and UPS you have. If your PSU has Active PFC, cheaper UPS units don't play nice with them as they're designed for "Pure Sine" units.