You may have waited too long before the cleaning of the dust bunnies. It has succumbed to heat stress/damage. You may have "bad caps", google for examples to check and verify against on your mtrbd.. Next, while it seems to boot(power-ON) it's not getting anyplace. next time, try a safe mode boot-up, hit the F8 key repeatedly to get into the safe mode. Once there, reboot and try the safe mode with networking option. Then run the [chkdsk /r], no brackets at the run button area. Allow it to finish, it may take some time before its done provided it runs at all and/or boots into safe mode. Otherwise, report back the results.
Compaq presario sr2020nx. The last time it worked it made sounds as if it were working hard to cool down. I opened it, and it was really dusty. Now when I start up it does nothing, nothing on the monitor, all the sounds are there (processor fan, HD, PSU fan) The processor light on the front stays on steady, but I don't hear it working. Another thing I find odd is that now after normal power down when I unplug it, then plug it back in, I do not have to hit the power button, it powers up as soon as I plug it in.
Is the computer wasted? (yes, I cleaned the dust out) What are your thoughts? Thanks in advance for any ideas.