I'm trying to fix an 18 month old Compaq Presario SR5722UK which seems to have got itself stuck in power saving mode. On booting, it whirrs into action, keyboard lights flash on briefly, but nothing on screen except message saying it's in power saving mode. After a few seconds, fans stop and keyboard becomes unresponsive. Power light on tower remains on though. I can't even get into the BIOS, although I'm not sure whether this is because of the unresponsive keyboard. I've tried disconnecting power lead, swapping RAM modules around, removing CMOS battery for 15 mins, have tried new PSU and dedicated graphics card (it's presently using onboard graphics) but nothing I've tried brings it to life. On googling the problem, this seems to be a very common problem with Compaqs but it seems to have a variety of solutions, most of which I've tried. Just wondering if you guys have any other bright ideas as to what to do please? Thank you in advance.