1. try the generic reset noted at https://www.cnet.com/forums/post/30c241c5-dd8b-4d73-b08d-c6e15897fe5f/
I don't know what you call a hard reset.
2. Go ahead and put a new cmos battery in it.
I just acquired a Toshiba L655 laptop. It was working fine. I left it unplugged the other night and the battery died . When I went to use it last night I plugged it in and it will not go past the Toshiba splash screen. I can not hit F2 or F12. If I hold any key down it starts beeping and will not stop till I hit the power button. All lights are on on the case. The HDD light flashs briefly. I can not turn off NUM lock and I can't turn on CAPS lock . Ever since I have had it there has been a red X over the power icon [ plugged in ] since I have had it I have never used it unplugged.
I reseated the memory powered on same thing happens I took the memory out and powered on all I got was a black screen. With the hard drive in or out same thing happens. Even tried to do a hard reset nothing happend.