help with old computer

hey well, i have this old pentium 4 which i want to get up and running, but the harddrive i believe is corrupt, so i have since taken the graphics card out,, now i have a windows cd, i wanted to reformat the computer, so i put everything back in,, now the pc wont start,,

it just makes a peeping noise, high pitched sound,,, nothing on the monitors,, just a sound,,

any suggestions??? is my whole system stuffed?

its an old computer so yeah not too sure

anyway, the beeps are like continuous for 2 seconds or so, then stops, then continues again,

You realy need to take a look at the BIOS chip on the motherboard and see who makes it, then you can look up the beeb code on the web.

Make sure the Graphics card and memory are connected correctly.

If you can, put the HDD into a different PC and reinstall windows. If the problem continues you could reset the CMOS on the bios to basically give you all default settings on the PC.

If it carries on then its a hardware problem... work it out by deduction! 

The minimum you need to POST is PSU, CPU, RAM, Video connected to your motherboard.  Disconnect anything else (HD, etc.), remove and re-set the video card and RAM - make sure they are securely inserted and try again.  You should at least see the POST details and get into the BIOS settings.  

If it still doesn't work, you can try replacing with spare parts one at a time (if you have any).

the thing is, my computer wont even load a screen up,,

when i turn it on,, the monitor stays black,, and the beep starts,,

1 Beep (No video) Memory refresh failure Bad memory 2 Beeps Memory parity error Bad memory 3 Beeps Base 64K mem failure Bad memory 4 Beeps Timer not operational Bad motherboard 5 Beeps Processor error Bad processor 6 Beeps 8042 Gate A20 failure Bad CPU or Motherboard 7 Beeps Processor exception Bad processor 8 Beeps Video memory error Bad video card or memory 9 Beeps ROM checksum error Bad BIOS 10 Beeps CMOS checksum error Bad motherboard 11 Beeps Cache memory bad Bad CPU or motherboard