Well i first installed iAtkos and it went into sleep mode fine, i could hit enter and wham it loaded again almost instantaneously. But now it doesnt actually sleep, the computer stays running with the fans going and there is no wya to resume state of working unless i power down the machine, any suggestions?

Try this sanga

Go to system preferences - energy saver - options tab - check everything, close and try to reboot

thanks, i'll try that now and let you know how it turns out

it has been 3 years. so, how? did it work?