no display

No signal from iGPU after unplugging my dGPU. So I plugged in a dGPU but if I use HDMI I get no signal, so I tried Display Port now I'm getting signal, but the monitor is black but if I go to the bios it works from like 1-2 seconds then goes black then after like 20–30 seconds it works for 1–2...

I had recently bought a gtx 960 oc and an i5 3570 to use in my pc ( upgrading from i3 3240) . But after assembling the pc, after 5-7 days the motherboard would not post a signal , just the cpu fans spinning and the gpu light flashing so I know that it's on. I tried changing the display ports ...

Guys, Problem statement: Computer with no display. Background: I had recently upgraded by system. from Core2Duo to i3 and below is my system spec CPU: Intel Core i3-6100 6th Gen LGA 1151 Processor with Cooler Master Hyper 212X - Premium Air CPU cooler M/B: Gigabyte GA-H110M-S2 Socket LGA 1151...