whenever i've dealt with compaq's, there were always problems with the psu. for example, i have a compaq armada laptop - sometimes it will crash, but there's no way of doing a hard reboot or poweroff. instead, i have to physically unplug it and physically remove the battery for it to shutoff. it's pretty ridiculous. a friend's desktop compaq had similar issues - sometimes it would crash and you would poweroff, then the on button wouldn't work!
i think compaq has improved a little over the years, but it's my experience that any oem computers (dell, compaq, hp, gateway...) will have some problems. the solution is to build it yourself, but in the case of laptops, that's not really possible.
if you're looking for a new computer anyway, go with the compaq. you might want to check out the HCL here on LQ for other peoples' experiences with compaq laptops.