i was playing fifa 14 and suddenly screen turns black while light on the power button in cpu still on but nothing on screen.
all fans are running well dont know what to do now as i cant boot in,not even the bios show up.
Any help would be appreciated.
Thanks in advance.
(i wrote it in such a rough way because by mistake i quit the webpage after writing the whole thing and got frustated)
Reseat the RAM for starters. If a RAM stick is the cause it can cause a system to not boot to even the bios. If you have 2 sticks of RAM or more in this system, try booting with 1 stick installed. If it doesnt boot from 1 stick. Shut it down and try another stick. If it still doesnt boot then swap out the power supply.thank you for responding.
well the thing is that i have just one ram installed.
so how can i know whether its the ram or psu that is preventing it from starting.To check the ram, download memtest (http://memtest.org/). Burn it to a cd using a dedicated .iso burning utility (http://www.petri.co.il/how_to_write_iso_files_to_cd.htm), make sure the cd drive is at the top of the boot ORDER in bios, then boot to the newly created cd and run the utility.Hi Allan... Their system is in PRETTY bad shape.. No BIOS access, so its not making it past POST. If they can get it to POST successfully then a memtest would be possible.

Given the fact that only 1 RAM stick is the system. If your system has a video CARD and also integrated video onboard, you can remove video card and connect to onboard integrated video to see if it will boot. If it boots it dosnt necessarily mean that the video card is the cause as for you COULD still have a weak power supply that by which with the video card removed its able to carry the load of the system now due to lesser current draw for power supply. But we will have a better DIRECTION to go in if the system boots with video card removed and running on onboard if this system has a video card to remove and successfully boots without the video card installed and instead is running on integrated video or APU video.

Make/Model computer info could also be helpful to know or if custom build all the part info to know what you have for a build?Thanks Dave.
you said that the vedio card might be using most of the power, bit i am running it with the integrated intel vedio card, and having a 450 watt psu i think it can provide more than enough.
Well now i have a couple of questions for you:
1) how can i know the root cause of the problem?
2) is it possible that something got blown inside?(nothing is overclocked)
3) what will fix the problem?