What PSU have you brought ? GPU diagnostics light up usually mean GPU problem. What model/age of GPU you have ?
I suspect it's your mainboard already since it's already very old. But if GPU also an old age model, you might as well replace them together.
I bought FSP Hydro G PRO Fully Modular 80+ Gold ATX 3.0 PCIe Gen5 PSU - 1000W
after asking my didi..... he say buy this, in case other part also gg.
My graphic card is ZOTAC Geforce GTX 1070, replaced at 2016.. Not very old...
Hmm.
when i push the power button . The gpu power and logo light up... MB chip fan move.. After 5sec it off
while the gpu power light still on so I assume there is power.
but cannot boot up.
cannot be ram issue right? but i did remove the ram and try 1 by 1 to slot in each..
sometime work the same as above but there is is some ram slot not able too...
*i will bring my gpu card to my didi there so test... but before there.. i still hope i can find out what problem la ;P