I have a Toshiba Satellite A135 that will not boot up. This started intermittantly and removing the battery and AC power cord and activating power switch, I could get it going again, but now it won't come on at all. I have all the power lights and the switch light will come on, but I don't hear the hard drive or the fan and I can't open the DVD/CD drawer. Any ideas?

Once it comes on, does it just stay in that frozen state or does it switch off after a while and try to start again (the most common scenario).