Windows 7: PC wont boot, just get black screen, but fans etc work?

Hi, really need all your urgent help as I'm freaking out a bit as its not really my comp, and its fairly new.

Okay my computer turns ON, but makes less noise than it used to when working, and just shows a black screen...doesn't even enter bios.

Recent changes:

Ok, I installed a new Graphics card, radeon hd 5450, installed the drivers etc, got it working perfectly. Then a short while after I also downloaded a reputable program called watt 2.2.5 to clear my windows non genuine message.



Then shortly after both, I was changing my theme, and the computer screen just went blank. Even keyboard wasn't working (I was pressing "caps" to see if caps light would come on and it didn't). So I powered off, now I just keep getting black screen! What has happened? How can I fix this? Really need your help! Thanks

do you no your way around the in side of your system? if so try removing the battery from your motherboard and leave the power unpluged for about 1 hour then put the battery back and plug your power cord back in and see what happens.

scrooge

Yes, I can give that a try, but I heard, if your bios doesn't have a backup, then this can cause problems?

it will just reset your bios settings so you will have to set them up again when and if you get it to post.


scrooge

Is this a likely cause then, given my circumstances? I auto assumed it would be linked to graphics card. Could graphics card have blew cmos battery then?

it maybe your videocard have you tryed removing it and putting the old one back in just to see if you get a post?
also when your system starts is there any beeping?

scrooge

I have onboard graphics also, so I plugged vga into that slot, and nothing. But I will try taking out video CARD completely tomorrow. Can't remember for beeps, I don't think there was any? But its kind of late, so I'll report back tomorrow.

Okay, so I removed the graphics card, and still nothing. Not looking good. Could the graphics card have caused something to blow? Kind of freaking out, because it's not my comp as I say.

So I turned back on, after taking the new Graphics card out, and same thing, fans spun, and to add, there were NO beeps at all.

Ok, so now I have removed to the cmos battery, and am now just waiting an hour to put back in. What would be my next step after checking that? Man I hope its nothing too expensive.

if your not getting any beeps and no post then it sound more like the motherboard.
i have to go to work so i can't help no more right now but maybe someone else will jump in. i'll check back latter tonight.

scrooge

If it is the mobo, could it be the graphics card that blew it? If so why? It was a light end, radeon hd 5450, why has it blown? I was advised it'd be ok. Are there other things that could've caused this? The card should've been fine, why has it blown it?