Hi my Computer will turn on but nothing comes up at all

[Andy_Aitken]

Hi there
My Computer will turn on but nothing comes up at all.
I have replaced the power supply and changed the hard drive, tried taking all non essential things off but to no avail.
When I turn it on all I can hear is the fans, no CPU noise, nothing.
Thinking it could be the motherboard or the CPU.
Its also a Dell, does anyone know if the after market motherboards are compatible or will I have to buy a new case and swap everything?

[Raptor]

Try replacing the CMOS battery first to see if that has any effect.

[Andy_Aitken]

Ok thanks, will try that

[GX1_Man]

Its also a Dell, does anyone know if the after market motherboards are compatible or will I have to buy a new case and swap everything?

Dell is pretty proprietary on motherboards, connections, and power supplies.

Did you use a Dell powersupply on there? Was it ANY different from it's previous state?

[Andy_Aitken]

Hi there
You may  have seen my post from a few weeks back which I've added at the bottom, I think I may have found the problem and need some help, I noticed that the holder that holds the heat Heat Sink down has 3 legs missing and the processor was not touching with the heat sink, would this cause the same problem as described in my last post?
"My Computer will turn on but nothing comes up at all.
I have replaced the power supply and changed the hard drive, tried taking all non essential things off but to no avail.
When I turn it on all I can hear is the fans, no CPU noise, nothing.
Thinking it could be the motherboard or the CPU?"
Thanks for any help you can give me

[patio]

Absolutely...depending on how old the machine is you should be able to find the 4 legged thingy at a local Computer repair shop or worst case scenario would be to have to order it online....

Who was the last person to work on this machine ? ?