Help!,my computer beeps at startup and the monitor doesnt even come on. The 4 LED lights inside are red and green, different to before. I formatted my hard drive, and this is what happened. What could it be?

Get out the owner's manual, there should be an explanation of the red/green combination of LEDs and what they mean. If you don't ahve the manual, do a google search. HTH

Mitch, sounds like its your e-buzzer on the motherboard (BIOS beeps). This could be due to any of the following HW faults. PSU, CPU, MB or RAM. What I would try and do first if I was you, is remove the BIOS battery for a small while (or use the clear CMOS jumpers on your MB - check manual for this) and try rebooting again, if that doesn't solve, flash the BIOS with the latest BIOS upgrade for your PC, and if your still getting beeps after that, try another power cord, reseat the RAM and the CPU. If it still doesn't fix, then there is something broken, mate and its gonna cost you. Hope this helps, anyway. Goodluck...

how many beeps dose it do? is it like 1 long beep and 4 or more quick beeps? try removing graphics card and putting back in firmly ie. a good firm (not to hard as to break board lol) push i have built many pc's in the years and this is a very common problem

thanx people. i might try disconnecting everything and reconnecting. I took the soound card, modem card, formatted the master in order to install xp. however, as you know it wont startup. its around 3 or 4 beeps. Ill have a go this afternoon and get back to you guys.

also try removing memory and re-place 1 stick at a time, the resson it's beeping is becouse 1 of your hardware ie. mem or graphics card is failing at POST i think 4 beeps is memory or graphics card. (cant remmeber atm but sounds more like to graphics or memory problem if your pc turns on then it dose the beeps and then hangs i am 99.5% sure its graphics card, although with out the correct number of beeps its diff to tell, the amount of beeps ie. 1 long beep and 4 short beeps is telling you that graphics card is failing and if i remember rite just 4 continues beeps means memory failing at POST) have you upgraded or moved your pc? desk top pc are not made to be moved around and is very possiable that graphics card needs re-seating, you may have to remove graphics card a few times sounds stupid i know but re-seating normaly dose the trick like i said a good firm push normaly resolves the problem . desktop PC's can be moody things when moved