Posted 01 July 2009 - 06:09 AM
Firstly, you say that the PC does not beep? Did it beep before when working correctly? Ie on bios post your normally get a beep after a successful post (not always but most motherboards/PCs do).
Also are you confident enough to move components around in your pc??
If so open it up, and making sure you are extra careful not to knock anything on the board i.e. capacitors n stuff.
Make sure you have no power enabled to the pc (sometimes the motherboard will have an led indicating power, wait for this to dissipate before touching anything, it can take upto 10 seconds in some cases!) Also you need to ground yourself to something in the house that is already grounded using an antistatic wriststrap (ie. a radiator) (the grounding is not always necessary but dont blame me if you static fry your hardware from lack of antistatic protection!)
Re-seat your memory, ide/sata cables (both at the motherboard end and the drive ends), all pci/agp/pci-e cards, all power cables, and possibly if you are confident enough to, the cpu itself. When I mean reseat, I mean actually totally remove/unplug each component then replace them in their original ports.
Alot of the time I have found unseated memory/pci/pci-e/agp cards due to heat expansion causes this problem. Also make sure your graphics card has power to it (if the facility for this exists) and especially check that all the motherboard power connections are seated correctly, I have noticed some power supplies use the E-ATX 24 pin but the last 4 pins dont seem to go in as cleanly (due to them being detachable!) so you need to ensure they are in tight, also check the cpu 12v 4 pin power is seated ok too!
Let me know if this works or not and I will try help you some more if I can if the above fails.