|"Power is plugged into P/Jack power protector..Monitor 17" flat screen is plugged into same it works."|
Some protection devices have an led that indicates the protection is still working, supposedly. If yours has that, is it still lit up ? If it isn't you must replace the device - try plugging drectly into AC power.
If the power failure event was caused by a lightning strike, the effects caused by that can pass through any protective device you are using It's even possible for computers that have their AC power source switched off to be damaged, if the computer is still plugged in - very high voltage spikes can be produced that can jump the contacts of any switch that is switched off. (The protected led may be still be on, yet damage was done.)
If you DO use (a) device(s) that protect(s) your computer from damage caused by power spikes and surges
- you computer's AC power source and EVERYTHING that connects to your computer must be pluggeed into such a device, otherwise you're not really protected.- everything that connects to your computer that plugs into AC power directly or via an AC to DC adapter, AND the cable that connects you to the internet (coax cable or telephone cable) if you're connected to a modem or a router or a combo router/modem via a network cable, and the telephone cable if you're using a dial-up modem connection to your computer or to a connected multi-function device or fax machine. It's recommended that if you need to use somerthing to protect a telelphone cable connection that you use a separate protection device for that - many protection devices will dump a voltage surge or spike from an AC source through the telephone cable port otherwise.
UPS devices usually do not have enough places to plug in everything connected to the computer.
Note that in most cases, all the protection devices have to be the same brand, otherwise the warranty against damage is not valid.
Try the suggestions for desktop computers in response 1.
If you are fortunate, it may be only the PS that has been damaged, or unplugging and plugging back in stuff may work.
Damaged power supplies often partially work - leds may come on, on the computer, fans and hard drives may spin, yet the PS will not fully work and you get no video and no mboard beeps. They have an integrated chip on them that determines when it gets turened fully on and that's easily damaged. The fuse inside the power supply usually does not blow in any case.
(The following does not apply to power supplies or assembled computers or computer cases with power supplies bought in North America.)
NOTE that if you're in the UK or some other place (Europe ?) that has the requirement, the power cord to the PS may have a tiny fuse in t's plug that may have blown - check that - there's a tiny access cover in the plug in that case that you need to remove or slide so you can examine the fuse. .
There is usually an led on the surface of the mboard that lights up when the power supply has live AC power to it, whether the computer is running or not.
If that doesn't light up, either your power supply is fried (most likely) or the mboard is severely damaged
Note that certain brands of PSs are well known to be a lot more likely to damage something else when they fail.
What brand is yours ?
E.g. BESTEC power supplies are used in most emachines desktop computers and some cheaper models of other brand names, and are available for use in generic systems. They have a reputation for frying something else while failing or when they fail completely - often the mboard, sometimes other things too.
Better quality power supplies have superior features that shut off the PS automatically under several different conditions, and are more likely to do that BEFORE they have been damaged. In that case, you may need to unplug the power supply or switch off the AC power to it for at least 5 minutes, then it will reset itself and work fine again.
E.g. I've needed to do that with Enermax PSs.