Work computer not reacting

[Minibiker]

Hi all

Need to pick your brains.

My PC in work is not switching on... Its a Dell Optiplex 3020.. All i get is a flashing orange plwer button on the front but nothing happens when i press...

Any suggestions please

 

[Minibiker]

Managed to get it running, Took the side pa el off and unplugged all the connections on pins and removed the CMOS battery, Reseated it all and it fired upfirst time