Solved Computer on,no Post ,no cursor

[Oldhead]

Power is on , hardrive is spinning , led flashing , power to all ext hardrives /ancillary etc.
No Post screen and signal not being received to screen. Re installed another screen and rebooted , Same problem (Nada) ???????
Turned power completely off and retried start , several times (nada )
System fans 4 in total , set to min speed and when booting noticed all fans ran at top rpm then settled back to normal speed???????

 

[zigzag3143]

Power is on , hardrive is spinning , led flashing , power to all ext hardrives /ancillary etc.
No Post screen and signal not being received to screen. Re installed another screen and rebooted , Same problem (Nada) ???????
Turned power completely off and retried start , several times (nada )
System fans 4 in total , set to min speed and when booting noticed all fans ran at top rpm then settled back to normal speed???????

video card? (or chipset)

 

[Oldhead]

Thought as much(video card) thanks .
Slight dust build up was around Mem chips , blew dust out and reseated chips , Now all is well Booted up fine .